DIY Guide to Cleaning Your Boat's Interior

How to care for finishes on a boat

There are lots of products for cleaning a boat, but they differ by whether you’re maintaining interior or exterior surfaces. In this article, let’s focus on cleaning tips for boat interiors to that will keep your vessel looking showroom new.

What you'll need:

• Microfiber cloths & wash mitts – Gentle on surfaces
• Stiff bristle brush – Ideal for scrubbing carpets & textured fiberglass
• Vacuum & wet vacuum – Removes dust, dirt, and excess moisture
• Marine-grade all-purpose cleaner – Safe for multiple surfaces
• Vinyl cleaner & protectant – Extends the life of your upholstery
• Oil-based soap – Perfect for teak surfaces
• White Vinegar & baking soda – A natural powerhouse for fabric cleaning
• Plastic scrubber (no-bristle) – Gentle yet effective for teak
• Metal cleaner – Keeps metal accents gleaming
• Fans or dehumidifiers – Speeds up drying and prevents mildew

Pro Tip: Whenever possible, opt for biodegradable, marine-safe cleaners to help protect the environment.

Step-by-Step Cleaning for Every Boat Interior Surface

1. Upholstery: Keeping Seats & Cushions Fresh

For vinyl cushions, clean with soap and water (1 gallon of water to ¼ cup of mild soap). Use a mild detergent like Dawn dish liquid that’s 90% biodegradable and has no phosphates that can harm the marine environment. Brush around the stitching and tackle stains with a soft brush or alcohol wipes.

Once clean, dry the vinyl with a soft cloth and then allow air drying time. Once fully dry, apply a vinyl protectant spray from 3M, Starbrite, 303, or Meguiar. Don’t use automotive vinyl cleaners that can break down marine vinyl UV inhibitors.

Steps:

Fabric Cushions

• Remove covers and wash them on a cold cycle.
• Air-dry to prevent shrinkage.
• Sprinkle baking soda on foam cushions, let sit for a few hours.
• Shake off excess and mist with a water-vinegar solution.
• Rinse cushions and squeeze out extra water.
• Air-dry in a well-ventilated area.

Vinyl Upholstery

• Wipe with a mild soap-and-water mix using a soft cloth.
• Rinse and dry with a microfiber towel.
• Tackle tough stains with marine vinyl cleaner.
• Apply a vinyl protectant for UV resistance and antimicrobial protection.

2. Carpets: Say Goodbye to Dirt & Stains

Vacuum and wash any marine flooring or carpet. If possible, detach it from the floor, clean underneath and then reattach the carpet when completely dry. Use a brush and Starbrite’s citrus cleaner on tough stains.

Steps:

• Park the boat on an incline for proper drainage.
• Vacuum thoroughly to remove loose dirt.
• Scrub with a stiff bristle brush, mild soap, and water.
• Use a wet vacuum to pull out excess moisture.
• Turn on fans or air conditioning to speed up drying.

Pro Tip: Deep clean carpets 2–3 times a year—or immediately after spills.

3. Teak Wood: Preserve the Natural Beauty

Solid or veneer wood surfaces can be wiped down with a soap and water or Murphy’s Oil Soap that comes in a convenient spray bottle. It’s a citrus cleaner that leaves the boat interior smelling fresh. A 50/50 solution of white vinegar and water in a squirt bottle can do wonders for cutting through salt that may have been tracked inside the boat. In fact, you can use that inexpensive and natural solution on most other surfaces in the boat as well.

Steps:

• Rinse teak daily to remove salt and debris.
• Scrub gently with oil-based soap, such as Murphy's Oil Soap, and a plastic scrubber.
• Avoid harsh chemicals that could damage the wood’s natural oils.
• Apply teak oil sparingly to maintain its rich, natural look.

4. Fiberglass & Nonslip Surfaces: Keep Them Shiny & Safe

To clean fiberglass interiors on a boat, start by rinsing the surface with fresh water to remove loose dirt and debris. Use a mild boat soap or a fiberglass cleaner with a soft sponge or microfiber cloth to scrub the area gently. Avoid harsh abrasives that could scratch the gel coat.

Steps:

•  Scrub with mild soap, water, and a stiff bristle brush.
• Rinse thoroughly to eliminate residue.
• For stubborn stains, use a bleach-based cleaner sparingly and rinse well.
• Finish with a nonskid treatment to enhance grip without dulling the shine.

Mold & Mildew Prevention Tips

Mildew inside a boat is not only odorous, it can also be destructive and it loves dark, airless spaces. Check for it inside lockers and under tables too. Clean any visible mildew (usually white or black) off surfaces with soap and water, a vinegar solution or commercial mildew cleaners from 3M, Starbrite, Marine 31 and others. Never use Clorox or Windex. Avoid chemicals like 409, GooGone or other non-marine cleaners that can be too abrasive or oily.

Steps:

• Use disinfectant wipes on hard surfaces.
• Place dehumidifiers in cabins and galley areas.
• Set up dehumidifier buckets to absorb excess moisture.
• Ventilate your boat after every trip to keep air circulating.

Dry everything completely after a thorough cleaning and then provide air circulation inside the boat. Chemical desiccants can help in small areas or use an electric dehumidifier but be sure to choose one that can’t start a fire or drain your Boston Whaler boat batteries. Keep up with this maintenance regime and your boating investment will hold its value for years to come.

Read more tips on how to maintain marine vinyl.