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Brown stains rinse, black stains dont. The PH of rain is more acidic. SH is more of an alkaline. The rain brings back the PH of the shingles to normal I think. It's like washing wood I think. Charge extra if they want it rinsed. I've never prewet a roof. But I have sprayed them twice, for the desired results.

Hey this is a roof pic, where I sprayed gutter dogs roof cleaning. It was 99 degres that day. Too hot on the roof to play. Shouldve sprayed the letters twice.

If it is hot it is best to pre-wet to cool it down. Same with decks before you spray cleaner on it.

Can't belive what im reading, Water on the roof? Thats nuts i love the steam! Spray your 1st coat wait 15 min then doit agian. I allways do It twice i never want to be called back and have to waste gas and time going back.

Am i wrong? i mean you guys hit it 2 times too right? I coul'd not imagen leaving the property when its not 100% clean 1/2 the time i don't even meet the home owner.

Craig Finney wrote:

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Water is cheaper than roof mix to cool a roof down when your mix is quickly evaporating.

Only respray on the trouble spots.

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 Bingo!!

Any rain yet Macky?

Craig we got a good rain and it looks great. The "customer" is now very pleased with the results. The water coming off the roof was unreal...brown and muddy in color then it ran clear after about 10 minutes.

Briefly. haha

The roof is only 6 years old but the comparison is very noticable. I'll get some pics up by the weekend.

-- Edited by Macky on Friday 17th of June 2011 08:14:33 AM