Collocations for rag - noun

clean
dirty, filthy, oily, old, tattered
bloodstained, bloody
damp, wet (both esp. AmE)
Wipe the board with a damp rag.

cleaning, dish (usually dishrag), wash (usually washrag)
She grabbed a washrag and wiped the floor.

bundle, heap, pile
He noticed what looked like a bundle of rags beside the road.

be dressed in, wear
I saw people dressed in rags begging on the street.

be wrapped in
The gun was wrapped in a dirty rag.

on a/the rag
He wiped his hands on an oily rag.

with a rag
I cleaned the board with an old rag.
You can wipe the stains off with a rag. (esp. AmE)