But didnt ask silly questions though!
Have you thought about hiring equipment, like a pressure washer if you aint the funds to buy at the moment. Then just buy parts slowly, ie a turbo nozzle, your own lance etc and so when you hire a machine, you can use your own parts to do a proper job!
When my machine was stolen, thankfully i kept the hose, lance and nozzle seperate. The local places to me which hire, a honda gx390 machine but the hose is limited in length and the lance/tip is not idea. 5 or 10 mins later, parts are switched over and the job begins.
Soft washing is great and has its benefits, but purely relying on that and especially with block drives.........aint good