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We just cleaned a big 5000 sq ft flat tile roof, in a very affluent part of Tampa.

The lady had gutters all around, with downspouts. We cleaned the roof, and carefully watched for run off around the downspouts, etc.

This tile roof had the large flat tiles, and we had to hit the faces of the tiles, sometimes 3 times, to get them clean.

After we were satisfied that the roof was cleaned and spotless, we left. 

Well, it rained that same evening. Not the usual Tampa Florida summertime rain we get nearly every day, in the summer, but a decent rain.

To make a long story short, all kinds of debris (including dead Frogs) started coming out of her gutters, and down the downspouts! 

I mean, it was nasty! 

In the back of the home, she had debris and dead Frogs all over her Lanai, even though there is a large gutter between the roof and the Lanai!

This was my clue, as to what went wrong! That gutter between the roof and Lanai should have caught any run off from the roof, and kept it off the Lanai!

Here is what went wrong on this roof cleaning job we recently did in Tampa. 

Unknown to us, her gutters and/or downspouts were filthy and were clogged. The chemical came off the roof, and was reactivated by the rain, and it actually cleaned the gutters and downspouts! 

All the filth, and previously clogged debris, from her filthy, stopped up gutters, came flushing down her downspouts, and we got blamed! 

It took me nearly 2 hours on the phone, to settle her down. She finally apologized to me, once we both realized what the problem was!