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I'm new to the pressure washing w/ chemicals. About six years ago I worked for a company that had me pressure washing flat surfaces driveways, porches, sidings, garages, etc... I did that for about six months. But I would actually scrub the drive ways with a push broom w/ a chem that was mixed...

Is there a link or site for Wolman/Olympic that offers certificatios and/or exams? I am looking for general info on pressure washing and starting a new business. Thanks