Cheers guys,
I'd like to do a good job here, since this guy is the owner of two local care homes which he wants a quote for (outside only - my fav), so it's possibly another £300 quids worth of work that I can do in a day; a tough day mind for Wor Lass and I; and if he accepts the quote that is!
The house is spot on though, I got £110 (not £120; typo) for a initial clean which wasn't too bad, but will get £85 for subsequent cleans (heavy-duty conservatory roof clean extra) and I reckon Wor Lass and I could knock it out in an hour. The owner is obviously not daft, since he wants to see our public liability insurance certificate prior to the next clean.
But given the state of the roof, I'd be surprised if anything removed the stains (they sure do look like hard- water stains and when you scrape it, it does come off (ish) eventually).
What about a conservatory roof ladder?
Are they any good?