The filthiest part of the bathroom is actually the shower floor/shower liner and the towel racks.
Although the toilet would be what is assumed to be the filthiest part of the bathroom, it's actually not unless it's never cleaned.
Instead, the shower floor/liner and towel racks are the filthiest parts of the bathroom as they are areas that are the biggest germ spots as they constantly remain damp and are usually skipped during cleaning and they can also harbor up to 60 times more bacteria than the toilet seat itself can.
Things on the shower floors and liners such as lingering moisture, skin cells and even the soap scum from soap create a nice prime breeding ground for millions of microbes, which makes the shower floors and liners the filthiest parts of the bathroom.
And often overlooked, even shower curtains can contain more bacteria than a toilet seat and even a glass shower door that is not cleaned often.
Towel racks and towel rails also are the most bacteria laden areas in the entire bathroom, aside from the shower floor and liner.
Towels trap moisture and then dry out on the towel racks and so they encourage mold growth, mildew growth and even dust if they are not regularly cleaned.
Even the bathroom sink and the sink drain also are other filthiest areas of the bathroom.
The sink drain is wet, dark and also frequently catches organic debris such as soap residue and even toothpaste, which is also what makes the bathroom sink and sink drain a magnet for bacteria and viruses to thrive and grow.
Even toothbrush holders are ranked among being the most contaminated items in the house as the toothbrush holders collect stagnant and germy water at the bottom.
Cleaning your shower, sink and tubs and washing towels often also help to reduce bacteria in the bathroom, although bacterial will still remain at least somewhat.