roofman
Purveyor of fine English buckets and mops
- Messages
- 12,569
- Location
- North West with water on 3 sides
I have all the equipment they would of used as we do roof washing (moss removal) and driveways etc..washer i use is a 13hp gx390 mated to an interpump W202 via a reduction gearbox that can give 200 bar all day long. The solution we use is a sodium hypochlorite at 15/1I don't think they used any acid, jetted it off then applied what he called a biocide which got rid of a lot of the blotches.
