Cleaning liquids for mops? (8)
I believe the answer is:
shampoos
'cleaning liquids for mops?' is the definition.
(mop can informally mean someone's hair)
This is all the clue.
(Other definitions for shampoos that I've seen before include "Soap compounds for washing hair" , "Hair cleaners" , "O Ma shops for the soaps" , "Cleansing agents" , "Hoops, Sam, for hair-washes" .)