I know its an old thread, but just wondered if any have done these from standing on a step ladder? Thing is ive said I'll do some tomorrow, and I know the slx 22 wont reach from ground, but should be ok from step ladder? I know its not ideal, as will be near on the top of the steps to get the panels at the top of the roof. Will just have to be steady. Also im just going to use pure water, ive heard this can be ok?
I wouldn't risk it mate, personally.
They can take some scrubbing and there's no way a standard stepladder will be ideal for the job.
You'll fall off, hurt yourself and you'll be off work for ages. They'll ring someone else up to do the job and it'll be done safely.
Let someone else have it, is my advice.