5 Tips To Prevent Your Bathroom Mirror From Rusting

bathroom mirror

Rust may be rustic - but not when it’s eating your bathroom mirror. Here’s why it happens and how you can deal with the problem.

A mirror rusts when its metal parts are exposed to too much moisture. Metal brackets and chrome trimmings are vulnerable but “mirror rot” also occurs. This is when moisture slips in between the glass and the reflective metal and the metal rusts.

There are several ways to prevent your bathroom mirror from rusting. There are also options to consider if your mirror is already rotting.

The Reasons Why Bathroom Mirrors Rust


Chrome is often added to a mirror’s edges and brackets to protect it from rust. So why is your chrome turning rusty? This is usually because something damaged the chrome and allowed the moisture to sneak in. Perhaps the mirror got scratched during a recent house move. After a lot of showers, the moisture in the air penetrates the scratch and rust begins to nibble and spread.

Another common problem is de-silvering. Also known as “mirror rot,” the condition is easy to diagnose. Your mirror is getting these unsightly dark blots behind the glass. It interferes with the mirror’s aesthetics and ability to reflect. What’s causing this?

Mirrors are specifically sealed so that moisture cannot get in between the glass and reflective metal plate. But ammonia can damage this sealing finish. Most cleaning products contain ammonia and when homeowners use it to clean their mirrors, they are unwittingly removing the sealing that blocks moisture and rust.

Once the moisture slips in between the two layers, it gets trapped and causes the metal to oxidize (rust).

 
How Do I Prevent My Chrome From Rusting?


Alright, the good news is that chrome pretty much takes care of itself. But it is a myth that chrome cannot rust. In all likelihood, any chrome fitting or part will one day rust. Thanks to wear and tear, there will be a scratch or nick that allows moisture to trigger the rusting process.

 
Tips 1 And 2: How To Treat Real Chrome And Chrome Paint


Before you start, make sure what coating your mirror has. Not all chrome is authentic. Some manufacturers use chrome paint to cut costs. If your mirror’s “chrome” scratches easily, then it is probably not the real deal. If there is already a rust problem, you must purchase a rust-penetrant remover product. 

chrome handle

This old rusty door handle has chrome paint

Care for your real chrome in the following way:

Step 1: Clean the surface. Chrome tends to collect stuff like soap scum, hair spray, and even toothpaste. Wipe these off with a clean cloth.

Step 2: Get a commercial chrome cleaner or use things in the home like vinegar, cola, lemon or lime juice. 

Step 3: Follow the commercial product’s instructions. If you are using a homemade solution, let the cola or vinegar sit on the chrome for a couple of minutes. Carefully scrub with a sponge, pat dry, and repeat until all the rust is removed. 

Step 4: The chrome needs to be sealed to stop moisture from restarting the rusting process again. Some commercial chrome polishes double as a sealant. You can also apply car wax to the chrome to seal the cracks.

How Do I Deal With Mirror Desilvering?

The bad news is that you are probably better off replacing the mirror. Fixing a mirror with this type of damage usually calls for replacing the reflective plate, glass, and sealants. Needless to say, this is not an easy DIY job and when done by a professional company, the price can get hairy. If you are worried that your mirror might rot, then there are a few things you can do to keep it looking great.

How to spend less time cleaning your house.

How To Protect Your Mirror From Rusting (Mirror Rot)

Let’s quickly recap the problem. Manufacturers are aware that bathroom mirrors run a higher risk than other household mirrors of developing rust. After all, most bathrooms include showers that steam the mirror repeatedly. For this reason, bathroom mirrors are treated with sealants to block moisture from getting in between the glass and reflective plate. 

Ammonia weakens and strips the sealants away. Presto. The moisture has found a way to get into your mirror and make some rust. 

Tip 3: How To Prevent Mirror Rot Or De-Silvering From Ruining Mirrors


  • Never use glass-cleaners that contain ammonia to clean your bathroom mirror (or any other mirror in the house for that matter).
  • Also, avoid products and cleaners that are ammonia-free but contain strong chemicals. The truth is that ammonia is not the only offender out there. Most powerful chemicals can damage or strip a mirror’s sealants. 
  • Play it safe and never spray the cleaner directly onto the mirror. Rather spray a cloth and wipe your mirror clean.
  • Make sure that your mirror stays dry. Wipe it dry thoroughly whenever you clean it as well as after every shower. 
  • Another way to protect your mirror from moisture is to keep the bathroom well-ventilated. Open the bathroom window and door after a shower. It won’t hurt to keep it open if you can during the day as well. 

You can also manage moisture in the bathroom by installing a bathroom extractor fan.

But I Want To Fix The De-Silvering Myself. What Are My Options?

chrome mirror

If you have the time and dedication to tackle this DIY, then give it a go. Maybe you love restoring old mirrors for a hobby or you just want to fix the bathroom mirror because you love working with your hands. Whatever your reason for wanting to fix mirror rot yourself, you do have several options to help you succeed.

Tip 4: Consider Using A Desilvering Repair Kit

The main benefit of a desilvering repair kit is that it most likely already contains all the things that you need to fix your mirror. Each one also comes with detailed instructions to guide you. Try to get the best kit that you can. A botched mirror looks even worse.

Tip 5: Consider Using Special Paint

You can find reflective paints at most hobby stores. Once again, purchase the most quality product that you can - you’ll see the results when you are finished. 

The hard part is to separate the glass and the plate. But once you manage to do that, clean the metal plate thoroughly and make sure that all the rust is removed. Take your time with this - if a speck of rust remains behind, it could “infect” the mirror again in the future with another rust breakout.

Apply at least two coats of the paint on the metal plate. But wait for the first one to dry before you apply the second coat. You can also just touch-up the affected area by removing the rust but not the entire silvering. Then simply paint that area with a few coats.

A Quick Summary On Why Bathroom Mirrors Can Rust

  • Chromed mirrors can rust. All it takes is a small amount of damage and moisture can corrode the metal.

  • Mirror desilvering happens when cleaners with strong chemicals are used to clean a mirror, which then strips the mirror of its protective sealants. 
  • Chrome can be fixed by thoroughly cleaning the affected area, removing the rust and giving it a good waxing.
  • Mirror rot is often not worth fixing but there are DIY options if you like to repair damaged mirrors.

About the Author Harry Thompson

Gaining a BSc Honours in building/ property maintenance at the University of Portsmouth Harry went into the field of renovating properties. Along the journey, he has developed a wide variety of home & garden DIY skills such as installing new kitchens and landscaping gardens.