A standard gas powered that has a minimum of 2200 psi.
Hints: standard bleach cut with water (about 1/16 bleach to water works great. Do in sections so water does not dry before pressure washing. Note: wash in spring and fall with cooler temps. Note: There are several options most of which use bleach anyway.)
Rinse with plain water or painted surface may bleach oit in the sun.
NEVER start PW without first turning on tge water. Tge pump can not run dry or the impeller will fry.
If yoir pump goes bad, buy a new pump and install yourself. They are about $100 and simple to install.
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