Mark ,Good question I hope everyone chips in.I have bought for the past 2 years a powder 55 gallon drum kit that cost around 50.00 But i wonder if I should make my on I copied this from alcoa Web site
Mildew accumulation-Mildew can collect on surfaces of all types of building products and is often evident on surfaces that have not been properly cared for and maintained. Normally, mildew will appear as black spots. Mildew is east to remove b using the basic cleaning solution above with addition of sodium hypochlorite as follows:
1/3 cup detergent (TideTM, for example)
2/3 cup trisodium phosphate (SoilaxTM, for example)
1 quart sodium hypochlorite 5% solution (CloroxTM, for example)
3 quarts water
These type of solutions make me also wonder if I should make my own instead of buying "HOUSE WASH" hopes this helps a little