The short answer to OP's question of will it work is no. Forget the pressure; cleaning is all about the water and there just isn't enough water from even the commercial electric pressure washers. They're great for washing cars and even cleaning out the garage. If you want to wash OFF the driveway, they (and the consumer ones for that matter) work find as well. But for exterior deep cleaning, you need at least 3GPM (I always recommend 4+, but some "prosumer" units have 3.2 and 3.5 -- and those are plenty).
Are people out there cleaning things with 1.x GPM electrics? Sure. That's what I used on my parent's house as I didn't want to lug my gas unit down there. (I've converted my electric units to accept the quick connect connectors like the gas units use so I can use the same hoses/guns). But I recommend that if you don't have a gas unit, go rent one with the surface cleaner attachment rather than using the electric unless you want to be out all day.
Quote:
loaned it out to a couple neighbors
loaned it out to a couple neighborsI will go do it for them before I'd let them touch my stuff.