This blue colorbond roof at Black Mountain was dirty and all the screws were rusty. If rusty screws are left too long, they will start to corrode the metal roof, leading to costly replacement of the entire roof. First up, we gave the roof a good clean, using the Jetts surface cleaner and pure water. Next we replaced the all screws with the matching colour (deep ocean). The results speak for themselves – have a look at the photos. The roof looks great, and risk of roof corrosion has been greatly reduced.