Getting Started - Cleaning & Brightening

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For seasoned decks, using Penofin’s Pro-Tech Cleaner will take care of any unsightly stains, mold, mildew, tree sap or other grime. This product is not exclusively for dirty decks; it is also a good idea to use for brand new wood - mold spores may be present and the cleaning process will eliminate them to get your staining process started on the right foot.

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Cleaning a Cedar Deck


  • Remove furniture and sweep away large debris, then thoroughly wet the entire deck surface.

  • Also wet down any vegetation in close proximity to the deck.

  • Mix the cleaning solution: one cup of concentrated cleaning granules per gallon of water. Make sure to mix thoroughly to dissolve the granules - this may work best in a separate bucket.

  • Apply the cleaning solution with a poly sprayer.

  • A white film may appear on the deck surface - this indicates that the solution was mixed properly and the active ingredients are working.

  • Agitate with a bristle broom or cleaning brush and allow to sit for 15-20 minutes, being sure to keep the deck damp.

  • Thoroughly rinse the deck. If you'll be brightening, you can begin that process right away. If you're moving on to staining, allow the deck to dry for 24 hours.


Like Pro-Tech Cleaner, Penofin’s Pro-Tech Brightener serves an important purpose for both new and old wood. Brightener rejuvenates gray, weathered wood and restores the mill-bright color. If used after cleaning, it re-establishes the wood’s PH balance to levels optimal for stain penetration. In new wood, Brightener reduces mill glaze that may be present, as well as neutralizes tannins that can cause unsightly discoloration if left untreated.

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  • Tape off any metal surfaces on or near the deck to avoid a reaction from occurring with the Brightener.

  • Wet down the deck and surrounding plant life.

  • Mix the brightening solution: two cups of concentrated brightening granules per gallon of water.

  • Apply the brightening solution with a poly sprayer.

  • Agitate with a bristle broom or cleaning brush and allow to sit for 10-15 minutes, being sure to keep the deck damp.

  • Thoroughly rinse the deck and allow to dry for 48 hours prior to staining.

Brightening a Cedar Deck

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