Covered or stained with or as if with dirt or other impurities
He reached for her with a grubby hand, looked at it, and dropped it.
Long pants or grubby clothes weren't necessary, as Dean had no intention of entering the mine.
There, staring up at the group, nestled in an assortment of other bones, packed into a grubby plaid shirt, was a cracked white skull.
Spaceports on podunk planets are suitably grubby.
Candles by Kathy - There is a wide variety here, including primitive grubby candles and "needful things."