I have a bidet with toilet paper to dry off/for guests/for various other uses for toilet paper.

Not near a window and the dust is thicker and primarily builds up below the toilet paper roll. It’s not the same as regular dust build up. I mitigate by placing the bin under the roll but it still gets everywhere.

It’s hard to get a picture but this is the thicker dust on my toilet brush, which sits just next to the bin/toilet. Toilet brush with dust on it