I have this area at the bottom of one of my toilets and I cannot figure out if it’s a stain or if the enamel has worn away.
I’m on a septic system so I am limited in the cleaners I can use, but I have tried various safe cleaners and it is not moved it at all.
Is it possible for enamel to wear away? The toilet is probably 15 to 20 years old.
Thanks in advance for any advice.