1.expense and higher overheads.
2.hassle!equipment problems
3.RSI-back/neck/shoulder/elbow problems after a few years
4.less consistent results-eg easier to make a bad job!
5.most domestic custys would prefer dry windows{trad!}
6.large van needed in the main for the ton of water u need to carry!
7.having to keep moving van on large compact estate work.
8.hoses, pumps freezing in winter!
please feel free to add more WFP guys!