What can I do with mold under grouting?
I had a similar problem and here's what I did.


using a scraping tool I removed the old grouting-glaze
I used Zep (incredibly effective with mold but really stinky)
then I cleaned the shower with water and let dry
purchased a tube of silicone caulk from Home depot
applied the a new layer of caulk where the old one was removed


To maintain a mold/mildew free shower I use Arm &amp; Hammer Clean Shower every day after I take a shower. I spray the stuff around the shower cabin right after I get out of the shower. It has a nice scent and it does a really good job keeping mold and mildew out!