Very few people clean roofs with an x-jet, but some do. The reason why is that you can only go so strong with an x-jet, and roofs generally require a pretty strong mix.
12V pumps are how most people start cleaning roofs. You can buy a 5 GPM 12V pump at an ag store, or online pressure washing vendor, for $150 or less.
You can buy 300’ of 1/2" polybraid hose for $115 (how much you want to use is up to you, 200’ is common, but some people go up to 300’).
You can make a gun out of a ball valve for $20, or just use a $5 garden hose sprayer.
You can buy a 55 gallon drum off craigslist for $20 to store your mix in.
Then you just need a battery. $120 will get you a nice deep cycle marine battery, but you can get by with something cheaper.
This is the cheap way to do it, but it works.
