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I’ve gotten that as well. I have had success using rubbing alcohol on those spots. Also helps to use an alcohol aftershave.
I’ve been using the Feedbro extension in Firefox for about 4-5 years now. It is pretty great.
Nightmare Reaper
I highly recommend the rinseworks bidet. It is designed much better than the one from the pic. You don’t have to shove your entire hand in the toilet to use it. https://rinseworks.com/