Been meaning to write this up... I bought the Yard Force YF4050 portable pressure washer a few months ago and have been using it to wash my Model S. It was about $250 on eBay. It has a 7 gallon bucket and has max 500psi. It's battery powered so you could literally bring this with you anywhere. No garden hose required (except for initial 1-time flushing to "prime" the system).
yardforceusa
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I only fill it up a little more than half way (~4 gallons worth) which gives me plenty of water to wet down the whole car and get rid of all the bugs and bird poop. It comes with 3 heads of varying spray diameters and power. The white head (wide diameter, low pressure) is good for wetting down the car while the red head (narrow diameter, high pressure) is good for bugs and bird poop. You can add whatever soap you want directly to the bucket. I use an ounce of Optimum No Rinse plus an ounce of Optimum Instant Detailer in 4 gallons, wet the whole car, and wash/dry with however many microfiber towels are needed depending on the amount of dirt. The best part is being able to power wash in the privacy of your own garage (assuming you don't mind having a few gallons of water on the ground.
Before:
After:
Nice and Clean:
yardforceusa
I only fill it up a little more than half way (~4 gallons worth) which gives me plenty of water to wet down the whole car and get rid of all the bugs and bird poop. It comes with 3 heads of varying spray diameters and power. The white head (wide diameter, low pressure) is good for wetting down the car while the red head (narrow diameter, high pressure) is good for bugs and bird poop. You can add whatever soap you want directly to the bucket. I use an ounce of Optimum No Rinse plus an ounce of Optimum Instant Detailer in 4 gallons, wet the whole car, and wash/dry with however many microfiber towels are needed depending on the amount of dirt. The best part is being able to power wash in the privacy of your own garage (assuming you don't mind having a few gallons of water on the ground.
Before:
After:
Nice and Clean: