Warm water + dish soap + soak for a few hours + wipe clean.
If they're really grimey, scrub them with a toothbrush. I cleaned some pretty dirty clay chips with that method and it worked pretty well. Sopranos are a lot easier to clean than those as well, so you should have no problems.
hmm i was under the impression that all the soprano chips were injection molded composites. While they have a stylish look to them they are a similar consistancy to my Cardinal chips (not a bad thing i like my cardi's). A bucked of water with some oxyclean soak'em for 20 mins or so and start taking em out and as u do scrub em on both sides with a brush then put em on a towel. If they actually are clay (like paulson clay) a 1 min dunk and scrub may work. I cleaned my grubby Cardi's with oxyclean on the advice of my mother (found it on this board after joining) but the oxy really did a good job on the cardi's though i swear the greens are slightly lighter than they were before. I'll see in a few months how it works on my new nexgens.
I would use Palmolive or Dawn because they cut are formulated to cut through grease. I used one of the two, a toothbrush and a little warm water on some various samples (ceramics, metal slugs, and paulsons) and they all came out sparkly clean. After I just dried then with a clean towel and let them air dry for an hour or so and they were good to go. Once dry you will want to oil the clay ones.
Re: Best Way?? 
I would use Palmolive or Dawn because they cut are formulated to cut through grease. I used one of the two, a toothbrush and a little warm water on some various samples (ceramics, metal slugs, and paulsons) and they all came out sparkly clean. After I just dried then with a clean towel and let them air dry for an hour or so and they were good to go. Once dry you will want to oil the clay ones.
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