I live in a flat and its a real pain dragging buckets of water 4 or five times down the stairs to the car to wash and rinse it. I can do the job in two trips with this handy pressure spayer, once with car shampoo in it and another with clean water to rinse. It holds a reasonable amount of water enough to wash a standard size hatchback, and has a reasonably powerful spray, although you do have to pump it a number of times during the washing process to keep the pressure up. It comes with an adjustable nozzle for different types of spray from a mist to a direct jet and it also comes with a shampoo type brush for giving the car a good scrub rather than just relying on the water jet. Obviously it is not as powerful as mains operated or 12v pressure washers, but considering it is pumped up manually it gives a reasonable force of water. It won't remove really hard, caked on muck with just the jet but is good enough to remove most mud and other lighter contamination.
I would have given it five stars but it was delivered with one of the parts missing, however after contacting the supplier they sent the missing part out very quickly, I got it the next day after reporting it missing, very good indeed.
Overall I am very pleased with my purchase.