You need to clean more. Plain and simple.
That is not “toilet paper dust”. That’s filth.

I don’t mean that in a derogatory way. You literally just have to clean more often.

It doesn’t.

Yes. If your bathroom is dirty, the solution is to clean it. Glad you recognize that. I hope you can put that knowledge to good use.

OP provided a picture. It’s just a dirty bathroom.

I clean my bathroom.

None of those sources are MSN.com