Routine Cleaning
For Moderate Dirt:
For moderate dust and dirt, spray the siding with clear water using a garden hose. Use a soft-bristled brush, such as a long-hauled car-washing brush, to lightly scrub dirt that doesn’t easily rinse off. Focus on areas under eaves, porches, awnings, and other overhangs that rainwater may not reach.
For Heavy Dirt:
For heavier dirt that may appear on Mastic siding over time, here are some tips for best maintenance. First, spray the siding with clear water using a garden hose. Then, gently scrub the dirt using a soft-bristled brush dipped in soapy water mixed with Trisodium Phosphate (TSP). Rinse thoroughly after cleaning. Wear gloves to protect your hands.
Dirt-Removing Recipe:
- 1/3 cup Laundry Detergent (e.g., Tide®)
- 2/3 cup Trisodium Phosphate (e.g., Soilax®)
- 1 Gallon Water
For Mildew Removal
Mildew often appears as black spots and can accumulate on all types of building materials. It’s easy to remove with the following solution. Gently scrub the affected area with a soapy mixture of TSP and Sodium Hypochlorite, then rinse thoroughly. Wear gloves for protection.
Mildew-Removing Recipe:
- 1/3 cup Laundry Detergent (e.g., Tide®)
- 2/3 cup Trisodium Phosphate (e.g., Soilax®)
- 1 Quart Sodium Hypochlorite 5% Solution (e.g., Clorox®)
- 3 Quarts Water
Removing Stubborn Substances
For caulking compounds, tar, and similar substances, apply mineral spirits directly to the affected area, then rinse thoroughly with water. Wear gloves to protect your hands.
Power Washing
If it is needed to power wash the Mastic Siding, read the power washer instructions carefully. Always hold the washer straight at eye level. Never aim it upward, as water may collect behind the siding and cause leaks, streaks, and decay. Use a 40-degree tip and set the pressure between 1,500 and 2,400 PSI.
