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Seal tile and grout
To prevent mold around the tub or shower,
spray the wall
with an antimicrobial treatment, then
seal the grout with two coats of grout
sealant to keep water from wicking in.
If the mold is extensive and tiles come
off, rebuild the wall with cement board
tile backer and new tile.
If the wall is sound but the mold
stains won't go away, try
regrouting. Scrape out the caulk
and stained grout, spray the wall
with antimicrobial treatment, regrout
and caulk and then coat the whole
wall with grout sealant.