On the sides, I would NOT recommend using the pressure washer, as the decals will not handle that pressure very will. Although, I do my roof with a 1200 psi unit, but I do not keep the tip close to the roof or in a narrow spray pattern. You will be amazed at how much dirt comes off the roof/AC unit. Just remember not to use a narrow stream and keep the tip well away from the roof. I use Tetfortd Roof cleaner/conditioner with it. I repeat this every 6 months.
As Tunce the traveler suggested, we use car soap and a regular hose/brush.
Just my thoughts,
Don
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