I just did this in my new laundry room. I compared using the sponge off method vs a microfiber towel, folded in quarters. No comparison. If you use your fingers to spread and keep the towel flat, it is amazing how much cleaner it gets the tile that a sponge. It is one of the best DIY tips I have ever discovered. I don't see why any professional would still use a sponge. The grout turned out perfect and there was so little haze left that I probably could have just let it be, but I did a post wash of vinegar and water to safe the next day.
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