I agree with the Soap method works well.. But in the land of sand and dust where im at the leaves need wiped down quite a bit when i used that mix ..
Ive also bought resently some Lady bugs ..
might try that are your plants indoors or out doors ?
right now i have mine indoors and tons of lady bugs too i put them in with the jungle room green house and they came in for the bad weather ..
i have 3 praying mantis Egg sacks from the same company..
the link for me local is
http://www.marchbiological.com/
there cheap but im sure you can find a closer out let i thats the rout you go .. its just too much dust and sand around here for me to go the spray method ..Tammy