Hi, I’m Scott Paul, a licensed exterior restoration contractor with over 30 years of experience and 10,000+ deck restorations. This buying guide to deck cleaner and wood deck cleaner products is based on my own hands-on field testing, not manufacturer claims.
Professional wood and deck cleaners for all types of exterior wood. A quality deck cleaner is the foundation of any successful staining project — even the best stain will fail prematurely if it’s applied over dirt, mildew, mill glaze, or old finish residue.
Quick Answer: Choosing a Deck Cleaner
- Standard wood cleaners (Restore-A-Deck, Defy) remove dirt, mildew, and graying to prep bare or lightly weathered wood
- Mildew-specific cleaners (RAD Guard) target and help prevent mold/algae regrowth between cleanings
- Kit combinations (RAD Packages, Gemini Kit) bundle cleaner and brightener together for a complete two-step prep in one purchase
- Brand-specific cleaners (Messmers Part A, EFC-38) are formulated to pair with that brand’s own stain system
How to Choose the Right Deck Cleaner
Picking the right deck cleaner depends on your wood’s current condition and what you plan to do next — clean and re-stain, remove mildew, or prep new wood for its first coat.
Bare Wood vs. Previously Stained Wood
New or bare wood typically just needs a standard cleaner to remove dirt, mill glaze, and surface graying before staining. Previously stained wood may need a stronger cleaner or a full stripper if the old finish is failing — a cleaner alone won’t remove intact old stain.
Mildew and Algae Concerns
If your deck has visible mold, mildew, or green/black staining, a mildew-specific cleaner like RAD Guard is worth using over a standard all-purpose cleaner, since it’s formulated to kill and help prevent regrowth rather than just lift dirt.
Cleaner-Only vs. Cleaner/Brightener Kits
A cleaner alone removes dirt and mildew but can leave the wood looking dull or grayish afterward. A cleaner/brightener kit (like the Restore-A-Deck Packages or Gemini Kit) adds a second step that neutralizes the cleaner’s pH, restores the wood’s natural color, and opens the grain for better stain absorption — this two-step process gives noticeably better results than cleaning alone.
Brand-Matched Cleaners
If you’re using a specific stain brand, its matching cleaner (like Messmers Part A or EFC-38) is formulated to work with that brand’s stain chemistry and prep requirements, so it’s often the safest choice if you already know which stain you’re using.
For independent, tested reviews of every major deck cleaner, see the full comparison at DeckStainHelp.
Deck Cleaner Comparison
| Product | Type | Best For | Starting Price |
|---|---|---|---|
| Restore-A-Deck Cleaner | General-purpose cleaner | Standard cleaning before staining | $39.99 |
| Restore-A-Deck Packages (300/600/1000/1600/3200) | Cleaner + Brightener Kit | Complete two-step prep, sized by deck square footage | $69.99 |
| RAD Guard Mildew Cleaner & Preventer | Mildew-specific cleaner | Decks with visible mold, mildew, or algae | $49.99 |
| Defy Wood Cleaner | General-purpose cleaner | Prepping for Defy Extreme stains | $35.99 |
| Messmers Part A Cleaner | Brand-matched cleaner | Prepping for Messmers stains, including hardwoods | $19.99 |
Deck Cleaner FAQ
Do I need a deck cleaner before staining?
Yes. Cleaning removes dirt, mildew, mill glaze, and surface graying that would otherwise prevent stain from penetrating and bonding properly. Skipping this step is one of the most common causes of premature stain failure, even with a high-quality stain.
What’s the difference between a deck cleaner and a deck stripper?
A deck cleaner removes dirt, mildew, and graying from bare or lightly weathered wood, but won’t remove an intact old stain or finish. A deck stripper is formulated to break down and remove existing stain or sealer so you can start fresh or switch products.
Should I use a cleaner or a cleaner/brightener kit?
A cleaner/brightener kit gives better results in most cases. The cleaner removes dirt and mildew, while the brightener neutralizes the cleaner’s pH, restores the wood’s natural color, and opens the grain for better stain absorption. Using a cleaner alone can leave wood looking dull or grayish.
How do I get rid of mold and mildew on my deck?
Use a mildew-specific cleaner like RAD Guard, which is formulated to kill existing mold and mildew and help prevent regrowth, rather than a standard all-purpose cleaner that mainly lifts surface dirt. Follow up with a brightener for the best results before staining.
Do I need to use the same brand of cleaner as my stain?
Not always, but it can simplify things. Brand-matched cleaners like Messmers Part A are formulated specifically for that brand’s stain system and prep requirements. A general-purpose cleaner like Restore-A-Deck works well with most stain brands as long as it’s followed by proper rinsing and drying.
How long should I wait to stain after cleaning a deck?
Most decks need at least 24 to 48 hours of dry weather after cleaning and brightening before staining, though this varies by product and weather conditions. Check your specific cleaner and brightener’s label for exact drying time recommendations.