Hose only.
Soft bristle brush like you would use on your vehicle for areas that might need a bit more scrubbing action. You can use the same detergent that you would use on your vehicle if necessary... but rinse thoroughly.
Pressure washers create micro-abrasions on the various surfaces that will create more issues in the future. Unlike a wood deck, you will not be resurfacing with a stain/sealer.
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