A well-maintained pontoon isn't just about appearances; it's also the best way to maximize its performance and longevity. Unlike other boats, pontoons sit directly on the water's surface, making them more prone to oxidation, staining, and marine buildup. The good news is that cleaning pontoons doesn't have to be difficult.
A few simple steps can keep your boat looking great and performing at its best, season after season.
How Do You Clean a Pontoon Boat?
1. Rinse After Every Outing to Prevent Stains and Buildup
Pontoons interact with the water differently than traditional boats. Because they sit on top of the water rather than cutting through it, the aluminum tubes are constantly exposed to debris, algae, and minerals that can cause staining and deterioration.
Use fresh water after each use to thoroughly rinse your pontoon, especially in saltwater environments. Salt accelerates corrosion and can leave a white residue on aluminum.
Pay attention to weld seams where dirt and contaminants tend to accumulate. If possible, lift your boat slightly to rinse the bottom of the pontoons, as this is where algae and scum build up the most.
Skipping rinsing might save you a few minutes at the dock, but it allows dirt and water minerals to dry onto the surface, making them much harder to remove later.
2. How To Clean Pontoons: Remove Oxidation
Aluminum oxidizes when exposed to air and water, forming a dull, chalky layer on the pontoons. Unlike painted or fiberglass boats, standard marine soaps won't restore the original shine of aluminum pontoons. You need a cleaner that is specifically formulated to break down oxidation without damaging the metal.
How to Choose the Right Cleaner:
Look for "aluminum pontoon cleaner" or "oxidation remover" products designed for marine use.
Avoid harsh acids like muriatic acid, which can cause streaking and weaken the aluminum over time. Test in a small area first to ensure the cleaner reacts well with your boat's surface.
How to Apply an Aluminum Cleaner:
- Spray or brush the cleaner onto the pontoons, focusing on areas with visible oxidation.
- Let it sit for the recommended time (usually 5-10 minutes), but don't let it dry.
- Scrub with a soft-bristle brush to help lift oxidation.
- Rinse thoroughly to remove all residue and prevent streaking.
3. Focus on Waterline Stains with a Targeted Solution
Waterline stains are one of the biggest challenges when cleaning pontoons, as mineral deposits, algae, and scum accumulate where the pontoons meet the water. These stains can be stubborn and require more than just soap and water.
Best Solutions for Waterline Stains:
- Vinegar and Water Solution: A 50/50 mix of white vinegar and water can break down mild stains naturally.
- Aluminum-Specific Hull Cleaner: Commercial cleaners like Alumabrite or Toon Brite dissolve tough stains without damaging the aluminum.
- Baking Soda Paste: A mixture of baking soda and water can act as a mild abrasive to lift stains without scratching.
How to Remove Waterline Stains:
- Apply the cleaner directly to the stained area.
- Let it sit for 5-10 minutes to break down deposits.
- Scrub with a soft brush or sponge to lift buildup.
- Rinse thoroughly and inspect for any remaining discoloration.
- Repeat if necessary, then apply a protectant to prevent future staining.
4. Remove Marine Growth from the Underside
If your pontoon boat sits in the water for extended periods, algae, barnacles, and scum can accumulate on the flat bottom surface of the tubes. This growth can negatively impact performance by increasing drag and reducing fuel efficiency.
How to Clean the Underside of Pontoons:
- Use a Pressure Washer: Set to medium pressure to blast off loose debris without damaging the aluminum.
- Apply an Aluminum Hull Cleaner: Spray a marine-safe cleaner formulated for underwater growth.
- Let It Sit: Give the cleaner time to break down tough buildup before scrubbing.
- Scrub Stubborn Areas: Use a long-handled soft-bristle brush to reach under the pontoons.
- Rinse Thoroughly: Remove all chemical residue before putting the boat back in the water.
For boats stored in the water, applying an antifouling spray after cleaning can help prevent algae and barnacle accumulation.
5. Polish to Protect Against Future Staining
Once the pontoons are clean, polishing adds a protective layer that helps repel dirt, stains, and oxidation. Regular polishing keeps aluminum looking bright and shiny.
Best Practices for Polishing Pontoons:
- Use marine-grade aluminum polish designed for pontoons.
- Apply with a microfiber cloth or buffer pad for even coverage.
- Work in small sections to avoid streaking.
- Buff the polish until the aluminum has a smooth, reflective finish.
Polishing also enhances the protective properties of aluminum sealants, which further help keep pontoons cleaner for longer.
6. Treat the Pontoons with an Aluminum Sealant
To minimize future maintenance, applying a marine-grade aluminum sealant is one of the best ways to clean pontoons - and keep them that way. A sealant repels water spots, dirt, and grime, protects against UV damage and oxidation, and simplifies future cleanings by reducing buildup.
How to Apply a Pontoon Sealant:
- Clean and dry the pontoons thoroughly before application.
- Apply a thin layer of aluminum sealant with a soft cloth.
- Buff it into the surface using circular motions.
- Let it cure for the recommended time before using the boat.
A good sealant lasts several months and significantly reduces the effort needed for future cleanings.
7. Pay Special Attention to Weld Seams and Brackets
Pontoon boats have multiple welded seams, brackets, and mounting points that tend to collect dirt and grime. If these areas aren't cleaned properly, buildup can lead to corrosion and weakened structural integrity.
How to Clean Weld Seams and Brackets:
- Use a small detailing brush or toothbrush to reach tight spaces.
- Rinse thoroughly to remove all cleaning residue.
- Dry completely to prevent trapped moisture from causing corrosion.
- Apply a light coat of sealant or polish to protect weld joints.
By keeping these areas clean, you'll extend the lifespan of your pontoon's structural components and maintain a like-new appearance.
The Best Way to Clean Pontoons for Long-Term Protection
Regular cleaning does more than keep your pontoon looking sharp; it keeps your boat performing at its best. A little maintenance goes a long way, and by sticking to a simple cleaning routine, you'll spend less time scrubbing and more time enjoying the water.
