I reckon there's 3 days in that WFP - - if you can get away with softwashing the majority you might get it done in one day,...
Whats softwashing Nathanael?
Lets say it takes 2 days... how much would you charge?
Softwashing uses a pressure washer attachment to spray cleaning solution quickly over large areas - - use the right chem & you don't need to scrub at all, just spray on, leave to work for 20 mins & rinse off. TFR works on some jobs, but I mostly use sodium hypochlorite (Bleach basically) which dissolves that green algae very quickly.
WFP I'd charge min €200 a day - - I'd most likely go in at €700 & hope to be done in 2.5 days.
If I could softwash it in 1 day I'd charge €450 (I'd spend about €150 on chems & petrol)