pH test your water supply. I wouldn't be surprsed if it's 'hard water' (alkaline).
Gene and Chaser are right, mix up your chemisty with distilled water, not the stuff you buy to drink! You can normally get it liters of the stuff for ¢¢¢ from automotive supply stores. They sell it for topping up car and marine batteries.
Also do a first wash, final wash and rinse with wetting agent/photo-flo using distilled water too.