[JM]

I've been using the generic equivalent of soft scrub with bleach. It does a fantastic job on the gulfport $1 chips that are a white base. I use a scrub brush that's meant for scrubbing your hands, its about an inch or so wide and 4" long (bristles that is). I wet the brush enough to make it damp, put a dot covering about 1/2 the inlay and with the chip on a terrycloth facecloth, scrub it vigorously full length strokes for 30 secs or so, then rotate it 90 degrees and 30 more seconds or so. Then if there's grime in the circles, go in circles one direction, then reverse it. Wipe it off and check for any spots that need a touch up. Flip it over and repeat. Then rinse in clean water and dry with a paper towel. They come out sparkling clean and all the nasty germs are killed by the bleach. Good enough to eat!