....just my opinion, but.... It looks like almost everybody posting here is the owner of a power washing company and has a vested interest in the info in their reply. As the owner of a decent-sized pressure / power washing company, I want business too. But there are many instances where you can get great results by just renting a pressure washer from Home Depot. I'm not going to get into specific instances where they're equivalent, but obviously, those types of cleanings that don't require a lot of knowledge or use of cleaning agents, don't need heated water, and on tight surfaces (not porous) will yield good results from DIYers and are of low risk of damage. Ok, I lied. Here's an example. You've got a bunch of dirty (just DIRTY) sealed pavers on a patio area by the backyard pool. A DIYer using a pressure washer, staying 10" away will clean that up in a heartbeat. I do completely agree that your time is worth something and you'll be spending some of it picking up a washer, returning it, you'll need a truck or a trailer, etc, etc...... .....again, just my opinion.