Apply a heavy-duty cleaning detergent to loosen the dirt, dust, grime, and stains on concrete floors. Allow the solution to sit for a few minutes. Then, use a pressure washer with at least 3,000 PSI to remove all the buildup. Increase water pressure to blast away stubborn stains.
Cover all nearby equipment, light fixtures, and glass surfaces before pressure washing the interior walls. Use a pressure wash system with about 1,500 to 3,000 PSI. Feel free to lower the water pressure or use a wider-angle nozzle depending on the fragility of the interior walls. Work in small sections at a time to minimize work disruption.
A degreaser will loosen up the oil, grease, and brake fluid stains found on a loading dock. Apply the degreasing soap and allow it to sit for 10-15 minutes. Use a power wash system — with the water temperature at 165°F — to rinse the surface completely.
Aluminum siding is durable and low-maintenance but it will still accumulate dust, dirt, stains, and mold over time. Use a soft wash system to first rinse the surfaces with low-pressure water. Then, apply a heavy-duty cleaning solution and let it sit for a few minutes. Use about 500 to 1,000 PSI to rinse the surface. Stay 12 inches from the surface and have the wand at a downward angle to prevent streaks.