noun
crud
KRUD/krʌd/
Unpleasant dirt or worthless residue.
Wet crud clogs the sink drain with hair, grease, and food scraps.

Etymology
The slang word came to mean an undesirable impurity. It may continue an older word for curd or coagulated matter, but that connection is uncertain.
In context
In stripping back all that crud—the horrible plastic signage—amazing heritage features have been uncovered, such as stained glass and hand-painted signs
More examples
- Scrub the crud off those potatoes before cooking them.
- Sticky crud collects around the bottle's cap.
- I don't believe any of that crud about her.
Forms
cruddy adjective — Dirty, grimy, or covered with unpleasant residue.