Best process to verbs a toliet? There are stains that will not come out of the toilet I...

There are stains that will not come out of the toilet I have. The stains own been in that a long time because they were in that before I moved surrounded by. Bleach does not work, vinegar doesn't work, what do you suggest?
Answers:    Get a hard sea cleaner for stains. Or Sno-Bol, there are plenty of products out in attendance.
i've used a pumice stone.it works on just roughly anything.