i can tell you what worked for me , and mind you I tried alllll the other things FIRST!! there are some good threads and info here about this topic and I am sure someone will direct you to them ( I read them , but don't know how to get to them , sorry) anyway... I used Maracyn , now I HATE using ANY chemicals but like I said I tried EVERYTHING else. So try what the others suggest first and if it don't work then try Maracyn. Good luck and act quick that stuffs spreads like crazzzzy!