Gutters are clogged on the inside or turning black on the outside Louisville Pressure Washing has your back. We actually pride ourselves on how new we can make your gutters look. Pressure Washing Alone WILL NOT get the black streaks, mold, and grime off your gutters. This is because most of the black is actually growing inside the oxidized paint. Pressure Pros Gutter Restore is formulated to penetrate and remove the first layer of oxidized paint taking all the unsightly grime with it.