Never use it outdoors in a breeze. It comes out more watery than foamy. Dow was about 30 cents cheaper than EZ-Off and worked just as well for my purposes. My Mom uses it to clean tiles and countertops, but I would advise you to test a small, inconspicuous area first without letting it sit before going hog-wild with the stuff. Don't bother to mix it.
Natural moisture takes care of the rest.
A guy I know who works construction said they sometimes just poured the mix, didn't add water at all, and it worked better than pre-mixing. I added a little water via garden-hose to be on the safe side. It's best to buy cheap venetian blinds and replace them when they get dirty beyond dusting. But if this is too rich for your blood, here's a tip on cleaning them. I've seen several brands of fire ant poison which are basically just expensive diazionon.