Hi i love pressure washers and i seem to have collected quit a few types. I use my karcher pressure washer for the garden decking and my KEW (alto) power washer for pressure washing the car. I bought a karcher t-racer from Chamjet a really useful pressure washer spare parts online shop. The karcher t-racer is a special patio cleaning tool that gives you a streak free finish and stops all the water splash back. I think this tool is better than the karcher dirtblaster although the dirtblaster is good for removing very stubbern dirt. Does any one know which pressure washer is the most powerful ?