I recently removed all grout that was yellowed and some mildew from shower/tub walls. Regrouted wait aprox. 3 days and sealed. Everything looked great. Like a new shower. Within 3-4 days I have several grout lines yellowing. Same places as before. Have tried to bleach, scrub with cleaners, zud etc. nothing helps. Any answers to why the yellowing is occurring in seems to be same places.
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