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I got these, gave 2 to my wife for kitchen use, and use the others to keep soaps and load my brush...then I move to my face, a mug, or a scuttle, depending on my mood.
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You can use it to put a pattern of lines on the bottom of a mug, or make a bunch of small protruding "dots" . Either ( or both ) will add a little agitation of air and water to the lather as you...