Pressure Washers

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Where can I go to get info on pressure washers to find out what psi I should purchase for cleaning patios and decks? I tried to find out if they have an adjustable psi and so far, I have only found ones that state they have different types of nozzles that you can use for an ajustable spray (fine to intense.) Is that all that I should be concerned with? I am afraid of damaging whatever I am going to use with a pressure washer. I need some advice! Thanks!