Seeing that fuzzy green or black growth on your beloved wooden bench can be disheartening. Don't worry—with the right approach, you can safely restore it. The best method balances effectiveness with protecting the wood's integrity.
First, safety first! Put on gloves and a mask. Move the bench to a well-ventilated, shaded area. Brush off loose debris with a stiff, dry brush.
For a natural and highly effective solution, white distilled vinegar is your best friend. Its acidity kills mildew. Mix equal parts vinegar and warm water in a spray bottle. Generously spray the solution onto the mildewed areas and let it sit for at least one hour. For heavy growth, use full-strength vinegar. After soaking, scrub the wood firmly with a stiff-bristled brush (not wire, which can damage the wood). Rinse thoroughly with a garden hose.
For tougher cases, a oxygenated bleach cleaner (like a powder that mixes with water) is excellent. It's much gentler on wood than chlorine bleach and won't harm surrounding plants. Follow the product's mixing instructions, apply, let it sit, scrub, and rinse completely.
A common question is about pressure washers. Use with extreme caution! A low-pressure setting (under 500 PSI) and a wide 40-degree nozzle held at least a foot away can work. However, holding it too close or using high pressure can gouge and permanently damage the soft wood grain.
The final, crucial step is prevention. After the bench is completely dry, apply a fresh coat of a water-repellent sealant, UV-protective oil, or stain designed for outdoor wood. This creates a barrier against future moisture and mildew growth.
Regularly cleaning your benches and ensuring they have good air circulation are the best long-term defenses. With this approach, your benches will stay clean, protected, and ready for enjoyment season after season.