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The original was posted on /r/diy by /u/envisiblenbk on 2023-08-11 21:39:34.

Just moved into our first home. The builders used grout where the tile meets the shower and few corners. Some of it has already started to crack and there’s rust (or maybe bacteria?) build up in those cracks. I removed most of the grout but some just won’t budge. How bad would it be if I just caulk over it?