Ver nice detailed work! Aren’t these machines great?!
With the first few engraves I cleaned with water, I noticed a slight raising of the grain. A while back Dan mentioned alcohol won’t do that, and ever since that is what I have used.
On those thousand tokens I did in maple, it was infinitely quicker to peel the mask before the operation and wash them instead of weeding them. I would drop 15 of them into alcohol and let them soak a few minutes before removing them one at a time an wiping them clean. By the time I got to the last one soaking it had been in alcohol for like 10 minutes. Never a trace of any effect on the wood.