OP, after thinking about this for a while, IMHO, you should probably find a good solution to stop the mold, our tile shower is almost 8 years old, used daily, never wiped down and no mold. I would first get rid of the mold, and then use a suitable sealer. If you are a DIYer, then as I mentioned Grout Shield is vert good, I have not used the products from Home Depot or Lowe's. Grout Shield does have a warning on their product to use a PH neutral cleaner
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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