The new business card holders (ZABH03 and ZABH31) and coasters (ZCOA01, ZCOA02, and ZCOA03) are a bit tougher to cleanup than what you're used to seeing. Use glass cleaner to get just a bit more solvent power than water and scrub vigorously. I pushed down and rotated the rag with my thumb to get the example here clean. Cleaning immediately after engraving can make it easier, too.



I ran a quick test on part of a coaster I already did.



This is how clean I was able to get it to. It required substantial scrubbing for just that small area.