Is It Safe to Put a Toilet Brush in the Dishwasher?
It sounds like the kind of cleaning shortcut that should work: put the toilet brush in the dishwasher, run a hot cycle, and let the machine do the dirty work.
But there’s a problem.
A toilet brush is designed for the bathroom—not for an appliance that cleans plates, glasses, and utensils. Even if a dishwasher uses hot water, putting a toilet brush inside it is not a good hygiene practice and isn’t a shortcut worth taking.
Here’s what you should do instead.
Why You Shouldn’t Put a Toilet Brush in the Dishwasher
1. It Can Create Cross-Contamination
The biggest concern is what the brush has come into contact with.
Toilet brushes can carry fecal matter, urine residue, bacteria, and other microorganisms. Putting one inside an appliance used for food-contact items creates an unnecessary contamination concern.
Even if the dishwasher cleans the brush, there’s no good reason to introduce bathroom contamination into the same machine used for your dishes.
Keep bathroom cleaning tools and kitchen-cleaning appliances completely separate.
2. A Dishwasher Isn’t a Toilet-Brush Disinfecting System
Another common assumption is that the dishwasher’s hot water will automatically sterilize anything placed inside it.
That’s not necessarily true.
Dishwashers have different temperatures and cycles, and a normal wash cycle is primarily designed to remove food particles, grease, and residue from dishes. A cycle labeled “sanitize” may provide additional heat, but that still doesn’t make a dishwasher an appropriate place to clean a toilet brush.
The safest approach is to use a disinfectant according to its label and intended application.
3. You Could Damage the Brush or Dishwasher
Toilet brushes aren’t necessarily designed for dishwasher temperatures.
Depending on the material, high heat could:
- Warp plastic components
- Damage bristles
- Loosen parts
- Create unpleasant odors
There’s also the possibility that debris from the brush could end up in the dishwasher filter or other internal components.
A new toilet brush is inexpensive compared with a dishwasher repair.
So What’s the Better Way to Clean a Toilet Brush?
You don’t need a dishwasher.
The simplest approach is to rinse the brush thoroughly after use, disinfect it when appropriate, and let it dry completely before putting it away.
Option 1: Use a Suitable Disinfectant
A household disinfectant labeled for the type of surface you’re treating can be used according to its instructions.
Follow the product’s:
- Recommended dilution
- Contact time
- Rinsing instructions
- Safety precautions
Don’t assume that leaving a disinfectant on the brush longer automatically makes it more effective.
Option 2: Use a Bleach Solution Carefully
If you choose bleach, follow the bleach manufacturer’s instructions for dilution and use.
Never mix bleach with vinegar, ammonia, toilet cleaner, or other cleaning products.
Mixing bleach with acidic products such as vinegar can release dangerous chlorine gas.
What About Vinegar and Baking Soda?
You’ll often see recipes recommending vinegar and baking soda for cleaning toilet brushes.
They can help loosen grime and reduce odors, but there’s an important distinction:
Cleaning is not the same as disinfecting.
The fizzing reaction may look powerful, but combining vinegar and baking soda largely neutralizes the acid and base. It shouldn’t be treated as a substitute for a properly labeled disinfectant when disinfection is the goal.
If you need to disinfect the brush, use a product specifically intended for that purpose and follow its instructions.
The Most Important Step: Let It Dry
One of the easiest mistakes is putting a wet toilet brush straight back into its holder.
Moisture creates a much better environment for microorganisms to persist and for unpleasant odors to develop.
After cleaning:
- Rinse the brush thoroughly.
- Shake off excess water.
- Allow it to air-dry completely.
- Return it to a clean, dry holder.
If possible, allow the brush to drip-dry over the toilet bowl for a short period before putting it away.
Don’t Forget the Brush Holder
The holder is often more neglected than the brush itself.
Dirty water can collect at the bottom, creating an unpleasant environment.
Clean the holder regularly by:
- Emptying standing water
- Washing it with soap and water
- Using an appropriate disinfectant when needed
- Allowing it to dry before replacing the brush
A clean brush inside a dirty, wet holder doesn’t solve the whole problem.
When Should You Replace a Toilet Brush?
There’s no universal rule that says every toilet brush must be replaced after exactly six or twelve months.
Instead, inspect it regularly.
Replace it when:
- Bristles become flattened or damaged
- The brush develops a persistent odor
- The handle becomes cracked
- It can no longer clean effectively
- It remains visibly dirty despite cleaning
A worn brush is difficult to clean properly and isn’t worth keeping indefinitely.
Common Mistakes to Avoid
Avoid these habits if you want a cleaner bathroom:
- ❌ Don’t put a toilet brush in the dishwasher.
- ❌ Don’t store it while it’s dripping wet.
- ❌ Don’t leave dirty water sitting in the holder.
- ❌ Don’t mix bleach with vinegar or other cleaners.
- ❌ Don’t assume a DIY mixture is automatically a disinfectant.
- ❌ Don’t use damaged or badly worn brushes indefinitely.
The Bottom Line
Putting a toilet brush in the dishwasher might sound like a clever shortcut, but it’s better to keep bathroom cleaning tools completely separate from anything used to clean food-contact items.
Instead, rinse the brush after use, disinfect it with an appropriate product when necessary, clean the holder regularly, and let everything dry thoroughly.
It’s a simple routine—and much safer than turning your dishwasher into a bathroom-cleaning appliance.
