Question on Monier Tile

MOTG1

New member
I have a house wash next week that has an issue... The house has Monier tile roof and it appears to be leaching out and staining the aluminum flashing. The customer said that previous pressure washers have taken the stain off with a normal house wash, but I'm not sure I believe it.

Anyone know what the leaching may be from and what I can use to remove it?

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