I've just quoted to clean a full mill, 5 floors. Quoted hourly rate - £34, and passed the cost of the boom (25m reach)
to the customer. The boom alone was £850 as its so big they can only fit one on the truck, hence a higher pick up and collection charge. I also increased the price by 20% for each floor up.....
i.e. 1st floor £xxx
2nd floor £xxx + 20% ect....