what would i need (ro unit)assuming i want to get through 35-40 houses a day(3 bedroomd, easy houses)
I don't think its possible to clean 40 houses a day using wfp unless you like doing 17 hour days.
For example it takes at least 15 minutes from start to finsh to completely clean a 3 bedroon house, top and bottom, windows, front and back, then you have to move to the next house and set up say 5 or 10 minutes, so on average the fastest I think you can clean a 3 bedroom house is 20 to 25 minutes.
40 houses x 25 minutes clean time = 1000 minutes = 16 hours 40 minutes + lunchbreak 20 minutes Total 17 hours