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138.3 if no sun.
i dont go higher than 000ppm now-a days. be carefull! especially as said, on hot south facing quick drying windows!
Quote from: GB Window cleaning on October 19, 2011, 04:08:31 pmi dont go higher than 000ppm now-a days. be carefull! especially as said, on hot south facing quick drying windows!why are the ones facing the sun prone to spot how dose that work and what happens??