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Nick_K wrote:

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Hi guys,

These are the typical roofs I want to target in Sydney Australia. They are terracotta tile roofs... I dont know what the gunk on them is.. maybe someone may know.
What would you advise for cleaning these? It was overcast when I took them...

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I would advise you to use the search function in the tile roof cleaning forum ?
We use Apple Cider with rubbing alcohol (isopropyl) for cleaning tile roofs in tampa.
The Isipropyl greatly aids the algae and dirt penetration charecteristics for cleaning tile roofs we see here in Tampa, FL better.