I'm not a fan of doing them, but if it's an existing customer and they are good (most of mine are) then I'll do it.
I like the conservatory clear of anything (I don't mind doing it) and mop and blade and then clean the floor after.
I price it well and only do it on rainy days. I arrange to phone in the morning (on the day) if they are in then great, if not, it gets put back to the next rainy day. A little bit of leeway on both sides, works well for me.
Having said all that, one of my customers is an ex army officer. He has the mother of all conservatories and wants the insides done. This year I have softwashed his huge driveway, plus 2 patios, side accesses, fsg all round, gutter clear, etc etc. All well paid and they are a very nice couple. His window clean is 4 weekly and never a problem.
I have managed to put this off until February next year. And when it arrives, it will be a tester of patience for me.