new to the power washing buisness..... wondering on what/how should i charge. i wanna get into power washing docks (piers) & decks/porches. maybe houses(do ya power the wall/sides of the house). i wanna also know how to time estimate jobs. i have a few jobs that i can line up w/in the next week. a 4500sq feet deck and a 125ft pier....... how/what should i charge for this job?