just spray some flash or mr muscle kitchen cleaner onto the blind, put on a pair of cotton gloves then run them along each slat, then sray clear water on them and repeat with clean gloves, works perfectly !!!
Mimififi's got it - that's how we clean ours: lay them over the outdoor chairs, dampen with hose, sponge over with plain old dishsoap, rinse thoroughly with hose, turn over and repeat. Do it early on a sunny day and they'll be dry before dinner. Works like a charm.