Not silly, that’s a common cleaning technique from janitor/cleaning staff i was told a while back. Use a little bit of what causes the stain/gunk and it helps break down the bonds by binding with the already-solidified object and trying to mix with it, weakening/changing the concentration of the ‘stuck’ substance

Not a B tier power, my God you just invented the governments secret delivery method. You’re planning perfect extraction and invasion strategies, nuclear fall back evacuation routes. You just became a national secret, son.