Hi all

Have just come across this job. The client wants to go ahead only if we can remove these water marks.

They are situated below the overflow of a pipe and coming down the both sides of the solar heating panels.

Any ideas. It also looks like there are a couple of streaks that have some brown streaks in it as well.

Attached are some pics

Thanks in advance

F9 should clean up the majority of those oxidation stains. But they will come back eventually. Something is causing them to exist. Looks like the lines from the solar heater are causing condensation or leaking. Stop or control that and you will resolve some of the future issues.