How To Clean Mould from A Toilet Tank | Cleaning A Toilet Tank, Plumb Tips

Lifting the lid of your toilet tank and finding a splotchy mess of black, pink, or green gunk is an unpleasant surprise. While it might look alarming, mould growing in your toilet tank is a common household issue. This happens because the dark, damp environment inside the tank is the perfect breeding ground for mould and bacteria to flourish, feeding on minerals in the water — making it essential to know how to Remove Black Mold effectively.

Don’t worry—you don’t need to call a plumber just yet. Dealing with mould in your toilet tank is usually a straightforward cleaning task. This guide will walk you through simple, effective methods for safely removing mould and keeping your toilet tank fresh. We’ll cover everything from step-by-step cleaning instructions to the best cleaners for the job and how to prevent mould from coming back.

Why Mould Grows Inside the Toilet Tank

Finding mould in your toilet tank can be confusing. After all, the water is replaced with every flush, right? The problem is that the tank’s environment creates ideal conditions for mould growth. The combination of stagnant water between flushes, darkness, and humidity makes the toilet tank a prime spot for mould spores to settle and multiply.

Different types of mould and bacteria can appear. You might see slimy pink streaks, which are actually caused by a bacterium called Serratia marcescens. Green or black mould is also common, and while it’s often not the toxic “black mould” (Stachybotrys chartarum), it can still cause problems for people who are allergic to mould. Minerals found in hard water can also contribute to the issue, creating a rough surface buildup that gives mould spores something to cling to. Infrequent cleaning allows this buildup to accumulate, providing mould with everything it needs to thrive.

How to Clean Mould from a Toilet Tank: A Step-by-Step Guide

Ready to tackle that mould problem? This simple cleaning process requires just a few basic supplies and about an hour of your time.

Step 1: Turn Off the Water and Empty the Tank

Before you start cleaning, you need to empty the toilet tank. Locate the water supply valve on the wall behind or next to the toilet and turn it clockwise to shut off the water. Then flush the toilet to drain the tank. You should hold the handle down until most of the water is gone.

Step 2: Add Your Cleaning Solution

Once the tank is empty, add your chosen cleaner. For a natural approach, pour one cup of white vinegar into the tank, ensuring it covers the bottom and lower walls. If you’re dealing with a more stubborn mould situation, you can use a diluted bleach solution. Mix one part bleach with ten parts water. Never mix bleach with other cleaning products, especially ammonia, as it can create toxic gas. Wear gloves and ensure the bathroom has proper ventilation by opening a window or turning on an exhaust fan.

Step 3: Let the Solution Sit

Patience is key. Allow your cleaning solution to sit in the tank for 20 to 60 minutes. This gives the vinegar or bleach time to break down and loosen the mould, making the next step much easier.

Step 4: Scrub the Tank

After letting the solution work its magic, it’s time to scrub. Use a long-handled toilet brush or a stiff-bristled scrub brush to clean the walls, floor, and components inside the tank. Pay close attention to corners and the area around the water line, where mould tends to develop. Don’t forget to clean the toilet tank lid, too.

Step 5: Turn the Water On and Flush

Once you’ve finished scrubbing, turn the water supply valve back on (counter-clockwise). Allow the toilet tank to refill completely. Flush the toilet three or four times to rinse away the cleaning solution and any remaining mould debris. Inspect the tank again, and if you still see any mould spots, repeat the process for a more thorough cleaning.

Best Cleaners for Removing Toilet Tank Mould

You have several options when choosing a cleaner for your toilet tank.

Natural Cleaners

• White Vinegar: Its acidic nature helps dissolve mineral buildup and kill mould. A mixture of white vinegar and water is a great all-purpose cleaner.
• Baking Soda: This mild abrasive can be mixed with water to make a paste for scrubbing away stains. For extra power, combine white vinegar and baking soda.
• Lemon Juice: Like vinegar, lemon juice’s citric acid is effective against mould.
• Hydrogen Peroxide: A 3% solution can be sprayed directly on mould to kill it.

Stronger Cleaners

• Bleach: A diluted bleach solution is highly effective for severe mould. Be sure to use one cup of bleach per gallon of water and ventilate the area well.
• Mould-Control Cleaners: Commercial products designed specifically for mould removal can be very effective. Look for a bathroom cleaner that is safe for use inside a toilet tank.

What to Avoid

Please do not use harsh abrasive powders or metal scrubbers, as they can scratch the porcelain and damage the plastic and rubber tank components. Damaged parts can lead to leaks, which can create more serious plumbing issues.

How to Treat Different Levels of Mould

The best approach depends on the amount of mould you’re dealing with.

• Light Mould: For a few small spots, a simple vinegar soak or a scrub with a baking soda paste is usually enough to eliminate mould.
• Moderate Mould: If the mould covers larger areas, use hydrogen peroxide or a mixture of white vinegar and baking soda for a more substantial effect.
• Severe Mould: For widespread mould growth, a bleach treatment or a specialised mould remover is your best bet to kill mould spores.

How to Prevent Mould from Coming Back

Cleaning mould is one thing; keeping it away is another. Regular cleaning is essential for maintaining a mould-free toilet tank. Here are some tips to keep mould from returning:

• Clean Monthly: Add 1 cup of white vinegar to your toilet tank once a month, then let it sit for 1 hour before flushing. This helps prevent moisture buildup and keeps the tank clean.
• Improve Ventilation: High humidity creates the perfect environment for mould. Ensure proper ventilation in your bathroom by using an exhaust fan or opening a window during and after showers.
• Inspect for Leaks: A slow leak within the tank can keep surfaces constantly damp. Inspect old flappers and fill valves, as these are common sources of plumbing issues. Replacing worn-out tank components can help prevent mould.
• Use Tank Tablets: Some in-tank cleaners are designed to prevent mould and mildew. Look for options that are safe for your toilet’s components.

Your Path to a Mould-Free Toilet

Removing mould from your toilet tank is a manageable task that can make a big difference in your bathroom’s hygiene. Using simple cleaners, such as white vinegar or a diluted bleach solution, can effectively scrub away existing mould. Remember that the key to preventing mould in your toilet is consistent maintenance. Regular cleaning and good ventilation will disrupt the environment that mould requires to grow, keeping your toilet tank clean and fresh.

Frequently Asked Questions

What causes mould to grow inside the toilet tank?

Mould thrives in dark, damp environments. The stagnant water, lack of light, and humidity inside a toilet tank create a perfect environment for mould spores to grow. Mineral buildup from hard water can also provide a surface for mould to attach to.

Is bleach safe to use in a toilet tank?

Yes, a diluted bleach solution is generally safe to use in a toilet tank. Mix one part bleach with ten parts water. However, never mix bleach with other cleaners, and always ensure the bathroom is well-ventilated. Using bleach too frequently can degrade rubber parts over time, so use it mainly for severe mould problems.

Can vinegar remove black mould?

White vinegar is effective at killing many common household mould types, including those often found in toilet tanks. Its acidic properties help break down and remove mould. For stubborn black mould, a thorough scrub after letting the vinegar sit is usually required.

How do I clean mould from hard-to-reach tank corners?

An old toothbrush or a small, stiff-bristled brush is perfect for getting into tight corners and around the tank components. Dipping the brush in your cleaning solution will help you scrub away mould in those tricky spots.

What prevents mould from coming back in the toilet tank?

The best way to prevent mould growth is to clean and reduce humidity regularly. Clean the tank monthly with white vinegar, ensure your bathroom has proper ventilation, and promptly fix any leaks or plumbing issues.