Heck, I just take a gallon milk jug and fill it with some hot water and rinse off the bike with that. I let it dry for a little while and then bring it inside. Why pay to rinse off your bike? A high preassure washer will get inside your bearings and you definetly don't want that. Invest in a good chain cleaner, buy some Simple Green, or other degreaser, and clean your drivetrain that way. It's hassle free and cheap and you'll feel better about taking care of your bike.