Large consumer gas pressure washers are the mother of all consumer-grade pressure washers.
They're up to 4x more effective than the most powerful electric consumer power washer.
Not only can you clean tougher stains and messes, but it'll take you less time to do it.
They are more expensive, but the investment is worth it if you have larger or tougher tasks to complete.
What Can it Do?
With up to 4000 PSI, you start getting into the category of, what shouldn't you clean due to all the power. Avoid cleaning siding or boats too closely at full strength because the water pressure could damage these. Luckily, most of these units have pressure adjustment knobs so you can turn down the water pressure.
These pressure washers have the power to strip old paint. You can clean large areas in a hurry. All large consumer gas units are cold water. If you need to remove oil or greasy stains, you'll probably need to step up to a hot water unit.