Hi Edora, I can recommend a Karcher cold water pressure washer, I hve used them for years (I ran a mobile vehicle valeting service) and they rarely give any trouble, you would do better going for the commercial range rather than the domestic models, they are not the cheapest but have found them reliable. Ours used to be powered by a generator in the back of the van, the supplier will or should be able to tell you if your power source is sufficient. Hope this helps