It's not icky. It's just dry lint with minerals and detergent mixed in. It's not like the black and green slime you find in the bottom of the outer tub of a Filter Flo when liquid detergents have been used in it, not is it as messy as the black smeary powder from a GE clutch or Westinghouse snubbers and belts, or the oil that is sprayed inside the cabinets of some old WP and Maytag machines when the tranny starts leaking.