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dabber wrote:

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Hey guys and gals in roof cleanning land , has anybody ever had any experience with white cement roof tiles looking yellowish after cleanning even couple months later after many hard rains , cleanned with 50/50 mix with TSP , borax , gain , fresh love,, cleanned up great but looks kinda yellow and the coustomer said somthing , thanks for your help , have another one to do on the same street  Dabber

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 were the roof tiles painted ?