We use specific equipment that mix concentrated chemicals with water, diluting them to proper concentration when soft wash house in Jackson MS. Too many chemicals can damage the surfaces and underlying surface easily. If we use too little pressure, it will not remove dirt. The same goes for pressure. Too much pressure and you can ruin delicate vinyl, you can take whitewashing off the brick, or you can damage the windows. You can also force water and chemicals under the siding. Too little pressure will rinse the chemicals well, leaving residue behind. So you can see how important it is to have the equipment and procedures misdialed.
House soft washing is a preferred alternative to pressure washing when cleaning the vinyl and wood siding. Gentle washing will treat the entire home and kill all organic matter that grows on its surface. The pressure washing removes the mold, but it does not kill the microlayer growing on a porous surface.