43C, how long depends on how dirty the chip, usually 1-2 minutes, though have gone longer.
^ This. It depends on the level of dirt (which may correspond to how long the chips were in play at the casino.)
- IIRC, Horseshoe Cleveland chips mostly came clean in 1-2 minutes. That casino was only open for 4 years, per the Chip Guide.
- Some older casinos have so many years of caked on dirt/gunk, that it may take a lot longer, 5 minutes or more.
- For chips with years of gunk on them, I've found a pre-soak in warm/hot water may help shorten the cleaning time in the ultrasonic.
- Sometimes the corners of the hat and cane, or in the ring on
THC mold chips, won't even be completely clean after 5 minutes.
- Also, be careful with older chips that might have paper inlays (Empress Joliet, California Bell, etc.**) Extended soak times can cause water to get into the paper inlays and cause discoloration. May want to clean those by hand, instead of or after just a short stint in the ultrasonic. [**Edit - some older chips have paper inlays under a vinyl (or is it mylar?) covering; and water can sometimes seep in under the vinyl, even without any visible signs that the vinyl is separating away. Always good to do a test run if you have some spare chips.]