Conservatory cleaning will vary depending on size and condition.
Generally speaking I will charge a high price not only to make sure I cover any unforseen problems but also to compensate for the lost time for window cleaning.
Some people will say to keep this type of work for wet weather but I work in the rain anyway so we just book it in and clean it.
I only use WFP for cleaning and find the results are excellent, the stiff bristle brushes really bring the conservatory up clean and get right into all the crevices.
As for cost, I charge 2.5 times the hourly window cleaning rate per operative. Some of you may charge by the hour or have your own pricing structure.
Gutter cleaning, I charge £2.50 per metre for wiping down and cleaning and I charge £4 per metre for a full empty, flush, wipe down including soffits and fascias.
Hope this helps,
best wishes, Trev