I just use a 1/3 solution of Chlorax and water. I also add about 1/2 cup of laundry soap. The bad spots may need to to give it a little brushing with a broom before washing off with a hose.
I can clean the whole house for $ 2 and 3 or 4 hours. Just washing with the water hose takes off most of the dirt. The chlorax and soap make it shine a little.
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