Laundromat cycle (5)
I believe the answer is:
rinse
'laundromat cycle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rinse that I've seen before include "Flush" , "Mouth cleansing solution" , "Wash without using soap" , "Hair colourant" , "blue one on top?" .)