Unfortunately, I have no novel approach, princessperky. Sodium hypochlorite --household bleach-- applied way more often than I want is my mainstay. Just using liquid bleach from the bottle most people buy for laundry is the least expensive way to do it. If you buy those spray-on or thickened products specifically for mold & mildew in bathrooms, you pay much more per quantity. However some of those products are pH adjusted so that there is less damage to your grout over time.
I was just reading at an online store that tannic acid in water can help remove mold and slow its spore from fruiting. It appears to be a very mild solution of tannic acid, which makes me wonder if a wash of black black tea will be effective as well. Tannic acid, though would slowly erode the grout. I think it would discolor grout, too, giving it that nasty nicotine stain color. With the commercial product they did recommend two applications with drying time in between, then a repeat of the 2-stage process every so often. Every so often might have meant every other week(?)--I've forgotten.
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