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 Seagull Poo gets on Tile Roofs near the water. Add some Sodium Hydroxide to your tile roof cleaning mix and/or some TSP.

We buy gallons of 50 percent Sodium Hydroxide, and add one of these to every 100 gallons of our mix. Some TSP can also be added in addition to the Sodium Hydroxide

Here is a great Tile Roof Cleaning Mix for 100 gallons, assuming you have fresh SH.

10 lbs TSP

1 Gallon 50 percent Sodium Hydroxide liquid

40 gallons Sodium Hypochlorite

45 gallons water

Add the 45 gallons water and Sodium Hydroxide to the tank, then stir in the TSP, allow to sit overnight.

Then add the 40 gallons Sodium Hypochlorite, stir again real well,  and go clean a tile roof.

Do NOT add Dawn or other surfactants on a glazed tile roof (makes them very slippery)

I promise you, this tile roof cleaning mix will clean up a drug addict, LOL

Both the TSP and Sodium Hydroxide work well together on the Seagull Poo, and other organic contaminates.

On a Bare Concrete Tile Roof, the TSP can be increased up to 20 lbs to really whiten up the concrete tiles.