I have mealy worms all over my Pothos... I can only assume they were there when I got them or in the horrendous potting soil I ended up getting (and replacing quickly). But they appear here for good. I rub off the leaves and stems with alcohol almost weekly... but they aren't getting the hint. Other than buying expensive pesticide (I'm flat out broke) is there another way to get rid of the nasty cottony balls of annoyance?