Thats a bummer. I have avoided working with G10 and Micarta (asthma issues and its toxic nature) and noticed that Terotuf is nontoxic so thought that may be a better option. Guess the grime after use is not worth it.
Some colors are better than others in regards to grime. Orange and maroon are the worst I have used and the tan and dark gray were the best.
My wife actually loves Terotuf and any knife I make for her she has a standing request for green, but for many the grunge is to much.