Always test any cleaning solution on a small, inconspicuous area of your deck first to ensure compatibility and desired results. Protect surrounding plants by covering them or rinsing them with water before and after applying deck wash. Wear appropriate safety gear, such as gloves and eye protection.
General Purpose Wood Deck Wash
This recipe is suitable for routine cleaning of most wood decks.
Ingredients:
- 1 gallon warm water
- 3/4 cup oxygen bleach (sodium percarbonate powder)
- 1/8 cup (1 fluid ounce) mild liquid dish soap (biodegradable, no ammonia or chlorine)
Mixing Instructions:
- In a plastic bucket, add the oxygen bleach to the warm water and stir until completely dissolved. Oxygen bleach activates in water and is most effective when freshly mixed.
- Gently stir in the liquid dish soap. Avoid creating excessive suds.
Application:
- Wet the deck surface with plain water.
- Apply the cleaning solution generously using a garden sprayer, mop, or deck brush.
- Let the solution sit on the surface for 10-15 minutes, keeping the deck wet. Do not allow it to dry.
- Scrub the deck with a stiff-bristled deck brush, moving in the direction of the wood grain.
- Rinse thoroughly with clean water from a garden hose until all residue is removed.
Heavy-Duty Wood Deck Wash (for Mold, Mildew & Algae)
This stronger solution is for decks with significant mold, mildew, or algae growth.
Ingredients:
- 1 gallon warm water
- 1 cup oxygen bleach (sodium percarbonate powder)
- 1/4 cup Trisodium Phosphate (TSP) substitute (optional, for very stubborn stains – ensure it is an eco-friendlier version if possible). Note: Pure TSP is a harsh chemical; use with caution and consider local regulations.
- 1/8 cup (1 fluid ounce) mild liquid dish soap
Mixing Instructions:
- In a plastic bucket, dissolve the oxygen bleach (and TSP substitute, if using) in warm water. Stir well.
- Add the liquid dish soap and mix gently.
Application:
- Pre-wet the deck.
- Apply the solution to the affected areas.
- Allow it to dwell for 15-20 minutes, ensuring the surface remains damp. Reapply solution if it starts to dry.
- Scrub vigorously with a deck brush. For stubborn areas, additional scrubbing may be required.
- Rinse thoroughly with clean water. Ensure all cleaning solution is washed away to prevent residue buildup.
- Caution: If using TSP or a strong substitute, wear heavy-duty gloves and eye protection. Protect plants and surrounding surfaces. Test in an inconspicuous area first. Avoid using chlorine bleach on wood as it can damage wood fibers and is harmful to plants.
Composite Deck Wash
Composite decking requires gentle cleaning. Always consult your decking manufacturer's specific cleaning guidelines first, as some ingredients can void warranties or damage the material.
Ingredients (General Gentle Cleaner):
- 1 gallon warm water
- 1/4 cup mild, pH-neutral dish soap (e.g., Dawn)
- Optional for stubborn spots: 1/2 cup white vinegar (test compatibility in an inconspicuous area first, as vinegar is acidic).
Mixing Instructions:
- Mix the dish soap (and vinegar, if using) with warm water in a bucket.
Application:
- Rinse the composite deck with plain water to remove loose debris.
- Apply the cleaning solution using a soft-bristled brush or mop.
- Gently scrub the surface. Avoid abrasive pads or stiff brushes that could scratch the composite material.
- Rinse thoroughly with clean water.
- For specific stains like grease or rust, refer to the manufacturer's recommendations for appropriate spot cleaners.
Important Considerations for All Deck Washes:
- Work in manageable sections, especially on large decks, to prevent the cleaning solution from drying prematurely.
- Avoid cleaning in direct, hot sunlight, which can cause the cleaner to evaporate too quickly.
- After cleaning a wood deck, allow it to dry completely (typically 24-48 hours) before applying any sealer or stain.
