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Well water can cause the brown also wait for a good rain and see what you have, the iron in well water will wash off & so will any brown streaks if not hit the area one more time, make sure your SH is not weak

Thanks for the response. We did have a good rain yesterday evening and the majority of the streaks are gone. There are some spots but I am going to touch them up. It was a neighbor's home and they were happy with the result (freebie). I am going to do another one on one of my rentals and just wait for the rain.

Roof Cleaning St Louis Missouri (636) 221 2582 wrote:

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I just had the same thing on a roof I did. I hit it again and then rinsed after about 1 hour and the brown came off with the rinse.

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As I have found over time and over many roofs.

It is no SIN as Chris puts it to have to touch up a roof after the required cleaning agent dwell time has been met.

IN the areas that look "ghost stained".

Spray again.

Sometimes it helps to spray a second application of cleaning agent above the offending area so the solution has a chance to sit above the area and drip onto it (technique) and then spray the actual areas again directly and lightly for full coverage.

Sometimes cling or "hang time " is an issue because of roof pitch.

In these situations it is sometimes necessary to "THICKEN " the cleaning mix.

All the other variables that have been mentioned previously is what makes our chosen profession unique, at times tough, and are just "service stripes" that come with experience in the field over many different situations and cleanings.

 

-- Edited by Roof Clean USA Georgia 229-227-0000 on Monday 18th of May 2009 08:53:14 AM