I never use to clean my chips, but I have noticed that my "vintage" chips have an even layer of smudge. No biggie, and I even love some of my vintage chips that have cigarette burns on them.
But I have noticed when I pick up house chips lately, that they often will have a splattering of tiny black dots on them. Look closely and I notice the dots are tiny chunks of black "goo".....ick......out comes the toothbrush and soap.
Don't people at the tables in LV ever wash their hands anymore...or do they just eat god-knows-what and smear it all over the chips?