Sponge off (4)
I believe the answer is:
wipe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sponge off</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wipe that I've seen before include "Clean with a damp cloth" , "Rub clean with a circular motion" , "Cancel (tape)" , "Remove with cloth" , "Clean with e.g. cloth" .)