After cutting out and engraving designs In Baltic birch, I usually soak them for a couple hours in white vinegar. I then rinse them off with soapy water and a sponge or soft bristle brush. Finally, I lay them out on a towel to dry. This does a really good job of cleaning off soot and eliminates the burned smell.
I’ve been experimenting more with laser engraved photos and am finally getting some good results. The only issue is they have a strong burned wood smell. Are any of you treating your finished wood photo engravings after completion? If so, does it Mess up your creation in any way?