What pressure washer psi do I need to primarily wash vehicles & maybe 2 story houses?

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I am starting up a mobile auto detailing business and have been getting by with just a basic 1800psi electric pressure washer. I've now started doing boats and rv's as well as sometimes doing wooden porches, decks, driveways and single story houses. I need more power definitely but am not sure what to get right now. Some people say 3000psi is needed to be able to wash a 2 story house using those long extension wands but if you are using a tall ladder then that doesnt really matter. But some say to clean a house only about 400-600psi is really needed. I definitely need more power but also need something that can indeed provide the power I need to clean the 2 story houses while also allowing me to safely tone down the pressure enough so I can use it to wash cars and recreational vehicles which will be its primary use. Right now Im looking at the units from Sams Club which are: a Black max 2400psi with a honda engine for only $200, a Black Max 2700psi for $300 or a Simpson 3100psi with Honda engine for $380. Which one would be the best fit for my needs? Thanks!

Answer
Definitely the 3100 psi Honda....There will be times where you'll be glad you had those extra psi's...Also, it would be a very good idea to purchase the extension wand for your safety. Climbing up & down a wet ladder is far from safe. A descent extension wand would usually run you about $100.00 +...However, well worth the investment...Best of luck..

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