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But when you go to wash the house, rent a pressure washer that has a detergent intake. Use a bit of TSP (trisodium phosphate) in with the water flow according to the directions on the label. Just be sure not to use too much pressure! Adjust the water pressure so that you are using the minimum amount necessary to clean the house. It is a very common mistake for contractors using pressure washers to use too much power, and then you end up with water in the soffits, under the siding, in joints, etc. If water is seeping in anywhere, it is too much pressure.