I have cleaned over 10,000 casino used poker chips (slight brag, I think, maybe not considering how long it took) and I have used the same method on all of them. It is a very simple method just very time consuming. First I take 20 chips and use magic eraser to clean the dirt off the rolling edges, for some chips you may not need to do this but I find that for white chips this is a must. After cleaning the edges I fill the sink with warm water and oxi clean, dump in the chips and mix it up a little. Then let them soak for 5-10 minuets. If they have shaped inlays I wouldn't go more than 5 minuets or you might get some discolored inlays, I am not sure if this has to do with the length of time they soak or the inlays were just that dirty that they became discolored. After soaking them I would rinse them off and use a foaming hand soap and toothbrush to scrub off the remaining dirt. For the scrubbing I just hold the chip in my palm and do a couple quick circles to both sides with the toothbrush and then rinse the soap off and move to a towel. One trick I found is to cut the bristles of the toothbrush in half it works a little better as they tend to be a little more rigid. Any gunk that was really stuck in the rims or hat & canes I used a pin to get out. Be careful if you use a pin cause you can damage the chips. Afterwards I would lay them on a towel and press another towel on top to dry them and put them in front of a fan for around half hour to fully dry. The cleaning process does tend to make the chip color fade a little so you will also want to wipe each chip with mineral oil. After oiling the chips I wipe them dry with a paint rag and again place them in front of a fan to fully dry. If in front of a fan I will let them sit for around 2-3 hours and if not in front of a fan I will let them sit until the next day. I hope this helps!