What is the best way to pressure clean a tiled roof?

Answer 1

Any chance you could hire a company to do this? That way, if any tiles come loose, they're responsible (make sure that's in the contract).
Since a tiled roof may show signs of mildew/mold, I would check with a manufacturer to see if you can use bleach. Obviously that would be much harder to apply but maybe there is another product that isn't so toxic to you.
Google some tile manufacturer companies...

Answer 2

my husband did this he sprayed from the peak downward it worked great