How To Clean The Waste Tank In Your Motorhome
How To Clean The
Grey Water Tank In
Your Motorhome

Motorhomes offer us the opportunity to create indelible memories, explore uncharted territories, and provide a unique home away from home. However, to maintain that sense of freedom and keep our motorhomes running efficiently, certain responsibilities accompany the luxury of mobile living. One of the crucial aspects is the proper maintenance and cleaning of the waste tanks. Motorhomes typically feature two waste tanks:
The black water tank, which captures waste from the toilet.
The grey water tank, responsible for collecting wastewater from sinks and showers.
While both tanks are crucial for maintaining the health and efficiency of a motorhome, this article focuses on the grey water tank. An uncared-for grey water tank can present its own set of challenges, ranging from unpleasant smells to blockages. Neglecting its maintenance can not only hinder your motorhome's performance but can also bring about health concerns.
Dive into this guide to gain a comprehensive understanding of the importance of cleaning the grey water tank in motorhomes. Explore the potential pitfalls of overlooking its care and arm yourself with best practices to ensure it remains in optimal condition. Whether you're a motorhome veteran or just starting your journey, by the end of this guide, you'll possess the insights to keep your grey water system running smoothly, safeguarding your motorhome's longevity and ensuring a pleasant living environment.

Why Clean Your Motorhome’s Grey Water Tank?
Understanding the importance of cleaning the grey water tank is paramount for the overall experience and maintenance of your motorhome. Here's why it's essential:
Health and Hygiene
Every time you wash your hands, dishes, or take a shower in your motorhome, the wastewater is directed to the grey water tank. Without regular cleaning, this tank can become a hotbed for bacteria, pathogens, and moulds. The resultant odours from an unclean grey water tank can make the motorhome environment less inviting and comfortable.
Moreover, neglecting the grey water tank can elevate the risk of cross-contamination. For example, bacteria from the tank can potentially infiltrate the freshwater supply or living space. Cleaning the grey water tank ensures a healthier, odour-free environment, offering peace of mind.
Prolonging the Life of Your Motorhome
Your motorhome represents a significant investment, and its upkeep is crucial for retaining its value and functionality. Regular cleaning of the grey water tank plays a pivotal role in this upkeep. Leftover residues, if allowed to harden and persist, can jeopardise the tank's internal linings and sensors.
A well cleaned grey water tank ensures that interconnected systems, such as sensors and plumbing, operate without a hitch. This proactive approach can save on potential repair costs and helps maintain the motorhome's value over its lifespan.
Efficiency and Performance
An improperly maintained grey water tank can develop blockages due to the accumulation of particles, residues from soaps, and other debris. Such clogs can strain the motorhome's plumbing system and pumps, making them prone to breakdowns and reducing their overall efficiency.

A Step-by-Step Guide to Cleaning Your Water Tank
Ensuring the cleanliness of your water tank is crucial for both the efficiency and longevity of your motorhome's waste system. Below is a step-by-step guide to effectively cleaning the grey water tank.
Choosing the Right Cleaning Agent
Given the unique challenges presented by grey water tanks, especially due to stored water, it's crucial to select the right cleaning agents. Whether you lean towards commercial products or natural alternatives, ensuring their effectiveness without compromising the integrity of your tank is paramount.
The Challenge with Stored Water: Water in grey water tanks can accumulate dirt, stains, bacteria, and algae. Bacteria can produce biofilm, a slimy residue that sticks to the tank's inner surfaces, contaminating the stored water and proving difficult to eliminate.
Quality Cleaners: The market offers a plethora of cleaning agents, but it's vital to choose those specially formulated for motorhome tanks. Specialist motorhome tank cleaning products, like those available at Motorhome Shop, strike a balance between potent cleaning and gentle care, ensuring they don't harm tank components.
Liquid Cleaners: These penetrate every nook of your grey water tank, with many formulas incorporating enzymes that naturally break down waste. Always opt for biodegradable solutions for an eco-conscious clean.
Following Instructions: Whether you're using a commercial solution or a homemade concoction, it's essential to adhere to recommended usage guidelines. Striking the right balance is key—using too much can leave chemical residues, while too little might prove ineffective.
Natural Alternatives: Natural alternatives may not be as potent as commercial solutions. A mixture of vinegar and baking soda, for instance, can create a foaming reaction that aids in dislodging waste residues. However, for tougher challenges or longstanding residues, specialist cleaning agents might be more effective.
Flushing and Rinsing
Fill the Tank with Water: After adding the cleaning agent, fill the tank to about half or three-quarters with fresh water. This water will help in agitating the insides of the tank, especially when the motorhome is moving.
Agitate the Solution: While you might not necessarily need to drive around, agitating the water by taking a short journey can help in dislodging residues. Alternatively, consider manually rocking the tank or using a tool to stir the water inside, ensuring the cleaning agent reaches all corners.
Drain the Tank: After allowing the cleaning solution to sit for a recommended duration, empty the tank completely, ensuring all loosened debris and the cleaning agent are flushed out.
Repeat If Necessary: If the tank has been neglected for an extended period, it might require multiple rinses. Continue the flushing process until the drained water is clear.
Inspecting the Tank
Look for Residues: Once emptied, if possible, inspect the tank's interior using a flashlight or a tank inspection camera. Ensure no debris or residues remain.
Sensor Check: Modern grey water tanks often come equipped with sensors indicating fill levels. Post-cleaning, these should ideally show the tank as empty. If they don't, there might still be residues interfering with them.
Seals and Valves: It's also crucial to ensure the tank's seals remain undamaged and that the valves operate without any hitches. Any compromised seals can lead to potential leaks, and malfunctioning valves can make future drainage difficult.

Top Products and Solutions for an Efficient Clean
Given the array of products available in the market, honing in on the best can be overwhelming. To assist in your quest for the ideal waste tank cleaner, we’ve curated a list of top-notch solutions.
Commercial Cleaning Solutions
Liquid Cleaners: These often offer a more thorough clean, penetrating every nook and cranny of your waste tank. Many come with beneficial enzymes that break down waste naturally without harmful chemicals. Ensure you choose a formula that's biodegradable for an eco-friendly clean.
Foaming Cleaners: These provide a deep clean by clinging to the walls of the tank and breaking down tough residues. They are excellent for tanks that haven't been cleaned in a while and need some extra care.
Maintenance Products
Tank Deodorisers: These are essential for keeping unpleasant odours at bay between cleans. They come in both liquid and tablet forms. Opt for those with natural ingredients for a chemical-free scent.
Tank Lubricants: These are designed to lubricate the valves and seals of the waste tank, ensuring they function smoothly. Regular use can prolong the life of these components, reducing maintenance costs.
Natural Alternatives
As previously touched on, we recommend specialist cleaning agents for deep cleans, however, some of these natural alternatives might work well for more frequent, mild cleans.
Vinegar and Baking Soda: Vinegar and baking soda create a fizzing action that helps in dislodging stuck particles and neutralising odours.
Lemon Juice: The natural acidity of lemon juice helps in breaking down waste while leaving a pleasant, refreshing scent.
Washing Up Liquid and Warm Water: For a mild clean, a mixture of washing up liquid/soap and warm water can be used to rinse the tank. The soap helps in breaking down grease and eliminating odours.
Accessories For Cleaning
Tank Rinser: Tank rinsers are attachments that go inside the tank, providing a high-pressure rinse to clean residues. They're great for a thorough clean.
Drain Hoses with Clear Elbow: A clear elbow attachment lets you see when the water runs clear during the draining process, ensuring that all waste has been removed.
Tank Inspection Camera: This nifty device lets you inspect the interiors of your tank after cleaning, ensuring every inch is spotless.

Determining Cleaning Frequency
Usage intensity plays a significant role in determining cleaning frequency. If you are touring frequently, your grey water tank will accumulate residues more rapidly. This means more regular cleaning is required, especially after significant stops. The residues, which often include soap and food particles, can decompose faster, particularly in warmer climates. This decomposition can lead to a quicker buildup and the potential for unpleasant odours, which can further indicate the need for more frequent cleaning.
When considering cleaning intervals, there are a few general recommendations to follow. For those who use their motorhome regularly, a monthly cleaning of the grey water tank is advisable. To maintain optimal cleanliness and performance, it's beneficial to undertake a deep clean using specialist cleaning agents 2 to 3 times annually.
For those who use their motorhome more sporadically, cleaning the grey water tank after each trip is recommended. This ensures that each journey starts with a fresh and clean system. Additionally, after periods of extended storage, it's particularly important to give the grey water tank a thorough cleaning. This is crucial because stagnant water and residues that may have been left can promote bacterial growth, compromising the cleanliness of the system.
For optimal results, it's advised to use specialist cleaning agents at the beginning and end of every season. If you find yourself travelling or stationed in warmer climates, consider applying these specialist agents even more frequently during the season.

Pro Maintenance Tips
Monitor Tank Sensors
Modern motorhomes come with sensors that indicate tank fullness. Keeping an eye on these can provide insight into when cleaning is due. If they start acting a bit strange, it’s time to do a deep clean.
Maintain Some Moisture
After cleaning, leave a bit of water at the bottom of your grey water tank. This helps prevent residue from sticking directly to the tank during the next use.
Regular Valve Maintenance
Every few months, ensure that the valves on your grey water tank open and close without hindrance. A stuck valve can make emptying the tank difficult.
Avoid Harsh Chemicals
Over-relying on aggressive chemicals can degrade your tank's material and seals. Opt for products specifically designed for motorhome grey water tanks.
Tank Insulation
Tanks with insulation are beneficial in colder climates, as they prevent wastewater from freezing. Cleaning these tanks requires caution; avoid using boiling water which could damage the insulation.
Baffles and Barriers
Components inside the tank, such as baffles, can assist in separating solids from liquids, leading to better drainage. During cleaning, care should be taken not to damage these parts.
Strategic Emptying
Aim to empty the grey water tank when it's at least two-thirds full, ensuring an efficient flow during the emptying process.
Mind What Goes Down
Ensure that only appropriate substances enter the grey water tank. Avoiding greasy substances and food solids can help prevent potential clogs.
Water Softeners
Using water softeners occasionally can help avoid mineral build-up in the tank, especially in areas known for hard water.

Explore Our Range of Grey Water Tank Cleaners
Maintaining the cleanliness and functionality of your grey water tank is essential for a comfortable and hassle-free motorhome experience. By understanding the right cleaning frequency and using appropriate products, you ensure a system that's both hygienic and durable.
Explore the comprehensive range of cleaning products available on Brownhills Accessory & Parts Shop. From water tank cleaning solutions to treatments for disinfecting and deodorising stored water, as well as top-of-the-line stored water purifiers, we have everything you need to keep your motorhome's water system in optimal condition. Embrace the best practices, and let your adventures be remembered for the right reasons.

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