How do you fix the problem when the old grout has turned gray and ugly?

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I am renovating my bathroom. The old tiles on the walls are in good condition, but the grout lines are gray and I want to make them white.

I don't want to apply grout – it would fall off, and I was offered to paint with a special grout pen. Who has used it and can tell me if it meets my needs? I was also thinking of trying silicone caulk or silicone paint.

Answers

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Silicone will darken and then turn black. Remove the old grout and apply new grout.

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Choose epoxy or polymer grouts that are highly resistant to moisture, deformation and abrasion.

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