Advice needed, cleaning a few years of dust off a car.
Nothing is better than a big bucket of the soapiest water you can make with Dawn dish washing liquid.
Hire a couple of young women wearing only T-shirts and give them a leaking hose. Make sure you film them and post it so we can see the before and after.
Use the Zoom on the camera to give us a good picture of what you're working with. We could then give each other "Pointers"