Before you start to pressure wash your aircraft, make sure that you have all the tools that you will need close at hand. You will need your pressure washer, any any attachments you may have, cleaning materials for your windshield, and your basic toolset in case you discover any issues with the plane.
Also, if you are going to clean the outside of your plane, you may as well work on the inside as well, so pick up appropriate upholstery cleaner and make sure you have a vacuum on hand for the carpets.
Check the pressure washer nozzles to see if they are clean since a clogged nozzle will increase the pressure in the water spray and it might damage the finish of your aircraft.
If you don’t have pressure washer attachments to make the job easier, you may want to consider purchasing an extension wand to reach the highest spots and a rotating power washer brush to clean the exhaust build up.
Do a mental walk-through of the procedure to plan the sequence in which you will wash each section so that you can perform a uniform pressure washing operation once you start.