Wash vigorously (5)
I believe the answer is:
scrub
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wash vigorously</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for scrub that I've seen before include "remove cosmetic" , "Rub hard to clean" , "Take out - clean" , "Cleanse" , "poor growth" .)