Hi Cissy, have you tried to carefully cut it away with a razor scrapping tool? That's what my dad (a licensed plumber) does and my son, (a card carrying plumbing apprentice) when they reset my fixtures.
Here's a tip too, bleach products are apparently very bad to use on Chalk sealants. I know because I loved my bleach pen in the bathroom, but it didn't love me, LOL. Both explained (repeatedly) how it should NEVER be used on sealant as they replaced it all cause the bleach made it come off all the places it wasn't supposed to, including the seal around the bottom of the toilet. Good luck Fickle
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