Replacing moldy sealant

There are a few spots I've neglected to replace old brittle sealant (around the kitchen sink) or never sealed at all (new faucet I installed 8 months ago). Now there's black gunk accruing under and around the sealant.

When I go to replace the sealant, how do I kill the mold so it's safe to seal over again?

Thanks for any advice you can offer.

Kethal ,

A bleach solution or white vinegar solution will kill it. You could spot test for colorfastness on all surfaces first. And there are places online that give solution ratios.

triptrapper OP ,

These are great options. Thanks so much for your help.

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