Home made solution
I clean my house and a few of my neighbors. Here is what I have found to be very good.
I bought a cleaner from Ace Hardware. 3/4 cup is added to a gardern sprayer along with 2.5 cups of bleach, the rest is water to make up 1 gallon of solution. I use a low pressure sprayer (not a garden hose) I wet the siding in small zones with the low pressure washer followed by the garden sprayer solution. Then in just a few minutes I brush (with a soft brush) the area with Meguiers cleaning/wax solution mixed with water. Then a thorough rinse with the low pressure sprayer. Don't leave the bleach mixture on for long and don't let it dry out.
The Meguiers is the cleaner/wax we used for years on our RV. It cleans well and leaves a very light wax on the surface. This makes it much easier to clean the next time. The low pressure sprayer actually uses way less water on the siding as it puts out a more atomized mist as compared to a straight stream of a garden hose and rinses very thoroughly.
I have found this to be very good and normally only needed once a year.
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