i have a huge lawn/landscape contract 57 aces of mowing and weedwhacking 45,000 tombstones in a graveyard. they want a price for power washing all 45,000 tomb stones. I have no idea where to start recomend equipment to use. Pricing would help too. Im thinking i need a huge tow-bind water tank with an engine to supply the power washers. or maybe there is a beter machine to use? I was thinking about charging $45,000 to do this but i dont know. What do you think? is that way too much?