I picked up a 6L Ultrasonic on
Amazon this week as well. Cleaned 900 of the ACDC hotstamp chips I bought recently in it using tap water and dish soap. The results were very acceptable and they chips are now clean of all the years of gunk on them. I ran the white 1's through a hand wash originally that worked well but inspired me to buy and ultrasonic. They went thru another 2 minutes in the ultrasonic and are now quite clean, only slightly off white. The reds ran for 2-3 cycles of btw 2-3 minutes depending on how much gunk was on them. I did batches of 20 chips each and between cycles I lifted the tray and using either a toothbrush, my fingers or a wooden toothpick dislodged all the crud from the edges. Another cycle of the ultrasonic and the debris was then removed. For the less used denominations like the 25's and 100's I only put them through one cycle of 2 minutes in as a full batch of each colour which was more than acceptable.
Now unfortunately all but the white chips look rather dry. I have no interest in oiling chips individually. What success is there with putting a bit of mineral oil in a bucket mixing with water and just dumping chips in to soak then dry later..... ? any suggested ratio's? I do not want oily or greasy chips but after seeing photos of before/afters I think my hotstamp solids could use a little