I have an electric Karcher Power Washer I picked up at Home Depot about 5 years ago, use it monthly, works great! Only problem it has had is the on of switch is stuck in the on position so being a cheap bastard I just plug it in when I need it!
BTW. Washing cars with it is sub par, just can't beet a sponge...... But the engine, wheels, wheel wells, driveway, garage, patio, grill, brick, and the list goes on it does a great job!