Rings left by surface cleaner

Regardless of the gentleman’s pursuit to make a living pressure washing this is a good post for this forum. I am in my first season pressure washing for a profit and am using equipment similar to the one mentioned. I’d like to understand the reason for this as well so I don’t make the same mistake and can learn from others. So far this circular pattern hasn’t occurred to me but I’m sure it will if my technique is wrong. By the way, I decided to pursue this vocation under very similar circumstances. Cleaned my father’s house, and mine, and was so pleased with the results that I thought others would want the same satisfaction with a clean driveway and exterior.

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