I use an aldi pressure washer bought for £80 with similar specs of a £200+ nilfisk pressure washer for use on the car, look at a units water flow rate rather than wattage, for patio pressure washing forget about using an electric unit I do this as a side business and see many people who have had a go themselves with a karcher and it looks atrocious I use a Honda gx390 21 litres per minute unit for my work which is way out of an electric karchers league, would be better of using a weed killer scraping out the joints and repointing.
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