If he was cleaning vinyl, he most likely had a bleach/water mixture. You spray on, let dwell for 5 minutes or so, then rinse off. The bleach removes any organic material on the vinyl. Works pretty good believe it or not, a lot of business are doing what they call “soft washing”. They use diferent equipment than what that individual was using, he was probably a homeowner possibly. We are getting a power washing rig this spring and will be offering that too. Hope that helps.
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