good advice all around. If old calk is ok, except for mildew then try to clean it. tile and/or cleanup area of building supply has strongest stuff. Maybe that will do it. If not, remove old and be 100% sure to get all soap scum off with strong cleaner - or it won't stick. Good soap scum cleaner needs rubber gloves and open windows or respirator sometimes. don't apply new calk when wet or it will be a waste. I use top notch GE for bathrooms. I like the tape mask method. tape, calk, finger, remove tape and one light go over with finger. Get an extra tube and practice on something else if you aren't confident or you will have an ugly mess. good luck.
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