Copied my post from a previous thread on the same....after this you can oil or not oil up to you...I don't oil.
For most chips the sink with warm water, soap and a brush/sponge/cloth will do very well, however
For a "Good Job" I have used my new ultrasonic. It has worked great though I recommend a model without a drain spout as it may corrode (anyway)
For chips I use this recipe which is cheap, safe and easy to source, others use fancier products but this works.
-tap water at 42celcius (put in warm water, the unit also has a heater/monitor)
- course salt, create a hypertonic solution
- dish soap, I tend to buy green palmolive
For really dirty/light colored/special chips
put in only enough chips that can sit flat in the tray and run for 20 second, then take out the chips and using a toothbrush scrub each chip, then put back in the tray and run for ~10-20 more seconds and remove and rinse in the sink, preferably with a strong spraying tap with warm water
For less special/less dirty chips
~20-60 chips in the tray (I have a 6L unit) run for ~30 seconds then for best results use tooth brush to rub over the chip sides and edges to loosen any raised "dirt" then place back in the tray and run for ~20-30 seconds more. Then rinse in the sink preferably with a strong spraying tap with warm water.
Alternatively you can skip the scrubbing with less ideal but acceptable results running for ~30 seconds with ~20 chips in the tray then spraying high pressure with hand tolerable hot water then running again for ~30 seconds and rinsing the same.
For general home use cleaning
Put in btw 20-100 of the same color/denom and run for ~30 second (for best clean remove each chip and scrub with toothbrush, however) then remove the chip tray and spray with high pressure warm water ensuring you spray off the gunk on the chips and repeat up to ~30 more seconds and respray again before a final ~20 seconds and rinse.....
This should remove all surface oil/debris from your chips....white chips become much better and could possibly benefit from an oxidizing agent but I have not experimented with that yet.
Here is a result of what I would call dirty/light colour chips treated with that method
result (the greens were the worst, forgot to take pictures but cleaned up great, cleaned in the real dirty method)