What is the crossword answer for the clue: Unwanted buildup

GUNK - a 4 letter word may be the answer you are looking for!

LINT - a 4 letter word may be the answer you are looking for!

TARTAR - a 6 letter word may be the answer you are looking for!

MOLD - a 4 letter word may be the answer you are looking for!

Unwanted buildup

4 Character Answers:

GUNK

LINT

MOLD

6 Character Answers:

TARTAR