How to Restore Western Red Cedar Outdoor Applications

Uncoated, weathered cedar can often be restored to its original color by applying commercial products called cleaners, brighteners or restorers. Although intended primarily for restoring horizontal wood surfaces, they generally work almost as well on vertical surfaces. Some products are formulated with thickening agents to help the liquid cling better to vertical surfaces. The manufacturer’s instructions should be followed for optimum effectiveness.

Commercially available cleaners and restorers generally fall into three categories: paint strippers, bleaches, and oxalic acid-based formulas. These products contain hazardous ingredients and should be used with caution.

Paint Strippers

Paint strippers will also remove oil-based stains and latex stains. Most are supplied as ready-to-use liquids. After use, residual stripper should be thoroughly rinsed from the wood surface before any other coating is applied.

Bleaches

Bleaches are effective in counteracting mildew but do little to remove dirt or other surface deposits. Aggressive scrubbing with caustic cleaners such as bleach will remove surface wood fibers and result in the wood having a rough, unnatural whitish tone.

Oxygenated bleach solutions are a better choice to kill mold/mildew, clean surfaces, and restore color simultaneously.  Apply a diluted powder solution with a vinyl brush, let sit for 20 minutes and brush in fresh water to rinse.

Oxalic Acid-Based Products

Oxalic acid-based products remove extractives bleed and might help diminish iron stains, but are not effective against mildew. After application of these products the wood should be thoroughly washed with clean water and allowed to dry completely before finishing.