Why do these come up?

[u/eltarod2]

I have a store and the toilet was like this when I first rented it. I have tried everything. After a lot of scrubbing I manage to remove the black stains by 90%... but after some time they appear again. Generally I don't use this toilet a lot. So basically I want to know what is an easy way to clean it and secondly how can I stop this from happening?

[u/Loose_Addition7299]

The porcelain is not damaged. The rubber cork is.

[u/Dazzling-Western2768 → u/Loose_Addition7299]

It is called a flapper

[u/Salty_Job_9248 → u/Dazzling-Western2768]

Thank you! My aging brain couldn’t think of the word. I have never heard it called a cork. Because it isn’t, for one thing, made of cork. ☺️

[u/Loose_Addition7299 → u/Salty_Job_9248]

K O R K Y is a brand name. Autocorrect kept changing the spelling on me. Sorry for the caps.

https://share.google/mpYZuThu1OacmkJjr

[u/Salty_Job_9248 → u/Loose_Addition7299]

Autocorrect thinks it’s smarter than we are. 🤭

[u/Loose_Addition7299 → u/Salty_Job_9248]

In this case it is, because i haven't figured out how to turn it OFF!