Review (1/5): BUY THIS ONLY IF YOU HAVE THE ACCOMPANYING UNIT
This solution goes in the special cleaner charger unit that is sold with the model 9171 razor. Since this charger is not sold separately, I wasted my money buying it to accompany my model 9161 razor. It is not supposed to be used as a stand alone cleaning solution. You clean the 9161 by just popping the heads up and rinsing it under running water.