Hi dear i need a paint of roof slate tiles grey.white spot on the roof tiles need to clean up have tried but not going.want to do paint.

For this application assuming the tiles have a thorough clean with a pressure washer and any moss is removed with AMW fungicidal Wash we can recommend Rust-Oleum Mathys Dac Hydro Plus.

For slate tiles you will need to prime with Primer 44HS or Pegafix prior to application.