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The most effective way to sanitize your sponge. It is a virtual tie between microwaving a damp sponge for one minute and cleaning it in the dishwasher with the drying cycle on. In both cases, 99.9 percent more bacteria were eliminated than with other methods tested. Use the microwave or dishwasher technique every other day.
For serious grout cleaning: Combine 1/2-cup baking soda, 1/4-cup borax and hot water to form a thin paste. Pour over the tile, scrub and rinse. If it leaves a residue on the grout after rinsing, dip a clean cloth in white vinegar and wipe the tile down again. It even removed a few stains in the grout that had been there for a while.
As old as I am, after 2 kids, husband, & pt cleaning job in college I still need domestication help.