SHADOW MAX Graffiti Shadow remover is one of five "Graffiti Max" products, each custom formulated for specific Graffiti Removal needs. If you are removing shadows or "ghosting" from any porous surface, SHADOW MAX is the right choice for the job. General Instructions Apply by trigger sprayer or pump sprayer. Allow to penetrate affected area for 15-20 minutes (30-40 minutes in cold temperatures). Use power washer with 15° tip with 1000 - 3000 PSI maximum pressure. For optimum perf ormance and removal speed use hot water (190°F.) Excellent results may be obtained with a cold water power washer with the above specification by doubling the dwell time (30-40 minutes). Repeat process if necessary. Clean up all equipment after each use with water. Do not use for any other purpose/removal, without thoroughly testing in an inconspicuous area for effect.