Pollen had coved newly installed pavers, so the home owner applied Zep driveway and concrete cleaner and Zinsser's Jomax mildew killer through his power washer.It left a efflorescence; I trhink. The pavers are gray - now they have a white cloudly look. Today I tried cleaning them with my standard cleaner which is a potassium hydroxide based cleaner. Result not so good. Some pavers look sthe same , other have a white outline on the face of the pavers that is in the shape of a playing card. Any advice on how to improve the appearance of these pavers?
Pollen had coved newly installed pavers, so the home owner applied Zep driveway and concrete cleaner and Zinsser's Jomax mildew killer through his power washer.It left a efflorescence; I trhink. The pavers are gray - now they have a white cloudly look. Today I tried cleaning them with my standard cleaner which is a potassium hydroxide based cleaner. Result not so good. Some pavers look sthe same , other have a white outline on the face of the pavers that is in the shape of a playing card. Any advice on how to improve the appearance of these pavers?
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