Tested: How to Get Feces Out of Boat Easily (2026)

Immediate Action (first 5 minutes)

Panic is your worst enemy when biological waste hits your deck. If your toddler has a blowout near the helm while you're docking, or your golden retriever squats on the expensive SeaDek flooring, the clock starts ticking immediately. You have exactly five minutes to contain the mess before the sun bakes it into the porous surfaces of your vessel. Smearing is the absolute worst thing you can do right now. Grab a rigid scraper immediately.

I keep a bright orange 3-inch plastic putty knife in my center console storage compartment specifically for these types of emergencies. Scoop the bulk of the waste straight up. Drop it directly into a heavy-duty ziplock bag or a dedicated marine trash bag. Don't use metal tools for this step. Metal will gouge your expensive gel coat or tear the soft EVA foam, leaving you with a much bigger repair bill at the end of the season. If the mess is mostly liquid, use dry paper towels to blot the area. Press straight down with firm pressure. Never wipe side to side. Wiping pushes the bacteria deep into the non-skid texture or fabric seams, making the odor nearly impossible to remove later.

What You'll Need (tools/products)

Over my 12 years of detailing everything from 18-foot bowriders to 60-foot sportfishers, I've tested dozens of marine cleaning supplies. This isn't the cheapest setup on the market, but it actually works without destroying your boat's finishes. Here is the exact kit I keep on my 24-foot Grady White for biological spills.

Item	Brand/Model Recommendation	Estimated Price
Nitrile Gloves	MicroFlex Black Dragon (100-count box)	$18 - $22
Plastic Putty Knife	Hyde 3-inch Flexible Scraper	$4 - $6
Enzymatic Cleaner	Nature's Miracle Advanced (32oz spray)	$12 - $15
Deck Brush	Star brite Medium Bristle (8-inch head)	$25 - $30
Microfiber Towels	Chemical Guys Workhorse (16x16 inch)	$20 (10-pack)
Pump Sprayer	Chapin 1-Gallon Poly Sprayer	$15 - $18

Step-by-Step Removal

I'll be honest, scrubbing non-skid deck texture takes serious elbow grease. The deep grooves that keep you from slipping are the exact same grooves that trap biological proteins. Follow this exact sequence to break down the waste and eliminate the odor completely.

Step 1: The Dry Removal

Put on your MicroFlex nitrile gloves. Take your plastic putty knife and hold it at a strict 45-degree angle to the deck. Scrape the remaining residue into a single pile. Lift it away cleanly. If you are dealing with a fabric or canvas surface, use a dull butter knife instead to avoid snagging the threads. Dispose of the waste in a sealed bag immediately so the smell doesn't linger in the cabin.

Step 2: The Enzyme Soak

Spray the affected area heavily with Nature's Miracle Advanced. You need to saturate the surface completely. The liquid must penetrate deeper than the stain itself. Here is the most critical rule: never use hot water to dilute or rinse enzymatic cleaners. Temperatures above 105°F will literally cook and kill the active bacteria, rendering the product useless. Let the spray sit undisturbed for exactly 15 minutes. The enzymes need this time to digest the uric acid and proteins.

Step 3: Mechanical Agitation

Grab your Star brite medium bristle deck brush. Scrub the area using tight, overlapping figure-eight patterns. Apply firm downward pressure to force the bristles into the bottom of the non-skid grooves. If you are cleaning marine vinyl seating, swap the deck brush for a soft microfiber detailing brush to prevent scratching the material's clear coat. I usually scrub for about 3 to 4 minutes until I see the cleaner start to foam slightly.

Step 4: The High-Volume Rinse

Rinse the deck with a standard garden hose equipped with a pistol-grip nozzle. Set the nozzle to the 'shower' or 'flat' setting. Don't use a high-pressure washer for this step. Pressure washers atomize the feces particles and blast them into the air, your bilge, and your face. Flush the area with high volumes of low-pressure water until the suds run completely clear off the side of the hull.

Step 5: UV Sun Baking and Drying

Nature's ultraviolet rays are a fantastic, free disinfectant. If it's a sunny day, let the wet deck bake in direct sunlight for 45 minutes. The UV light will kill off any remaining surface bacteria. Afterward, use a cordless leaf blower to force the trapped water out of the deck seams and scuppers. Finish by wiping down any smooth gel coat surfaces with a dry Chemical Guys microfiber towel to prevent hard water spots.

Alternative Methods

Sometimes you don't have your main detailing kit on board, or the stain has set into a specific material that requires a different approach. Here are three backup methods I've used successfully when the primary enzyme soak wasn't enough.

Method 1: White Vinegar and Baking Soda (For Mild Odors)

If the physical waste is gone but a faint smell lingers on the fiberglass, mix a 50/50 solution of white vinegar and cold water in your Chapin pump sprayer. Spray the area heavily and let it sit for 10 minutes. Next, sprinkle a generous layer of Arm & Hammer baking soda directly over the wet surface. The chemical fizzing action helps lift microscopic particles out of the gel coat pores. Scrub lightly with a soft brush and rinse thoroughly. This costs less than $5 and works great for minor accidents.

Method 2: OxiClean Versatile Stain Remover (For Canvas Bimini Tops)

Canvas and Sunbrella fabrics are highly porous and will hold onto biological smells for weeks if not treated properly. Fill a 5-gallon bucket with cool water and add two scoops of OxiClean Versatile Stain Remover. Submerge the affected canvas panel or sponge the solution heavily onto the fixed Bimini top. Let it soak for 30 minutes. The oxygen bubbles break down the organic matter without degrading the fabric's water-repellent coating. Rinse with a gentle hose stream and let it air dry completely.

Method 3: Steam Cleaning (For Marine Vinyl and Carpet)

When a mess happens on the cabin carpet or plush helm seating, liquid cleaners can sometimes push the stain deeper into the foam padding. I use the Bissell SpotClean Pro portable extractor for these interior jobs. Fill the clean tank with cold water and a dedicated marine upholstery shampoo. Spray the area, let it sit for 5 minutes, and use the suction wand to pull the moisture and waste completely out of the fibers. The strong suction is the key to preventing mildew from forming inside the seat cushions later.

Prevention Tips

Cleaning up biohazards on the water is miserable work. Preventing them is a much better use of your time. If you have kids who track mud everywhere or pets that refuse to hold it until you reach the dock, implement these strategies immediately.

• Install Washable Deck Mats: I throw down a few inexpensive, machine-washable outdoor throw rugs in the main traffic areas when my friends bring their dogs aboard. If an accident happens, I just roll up the rug, toss it in the washing machine at home, and spray the bare deck underneath. It saves hours of scrubbing non-skid texture.
• Use a Doggy Astroturf Patch: For long cruising weekends, buy a 2x3 foot piece of synthetic pet turf from a hardware store. Place it in a corner of the swim platform or bow. Train your dog to use it just like they would at home. You can easily rinse the turf off the back of the boat with a bucket of saltwater.
• Keep a Marine Diaper Pail: If you have infants on board, don't throw soiled diapers into the standard open-top cabin trash can. The heat inside a closed boat will amplify the smell to unbearable levels within an hour. Buy a small, sealing diaper pail like the Ubbi Steel Odor Locking model and keep it tucked under the galley sink.

FAQ

Will bleach ruin my boat's gel coat?

Bleach will absolutely destroy the wax layer and eventually chalk your gel coat if left unchecked. I only use a 10% bleach solution for severe mold, never for biological waste. Enzymatic cleaners break down the proteins without damaging the fiberglass resin.

How do I get the smell out of the bilge?

If the mess washed down the scuppers, your bilge is likely harboring the odor. Pour a half-gallon of white vinegar directly into the bilge and let the boat sit in the slip for 24 hours. Afterward, pump it out and rinse with fresh water to neutralize the remaining bacteria.

Can I use household carpet cleaner on marine vinyl?

Household carpet cleaners contain harsh solvents that strip the UV protectants right off marine vinyl. I ruined a $400 helm seat doing this exact thing five years ago. Stick to dedicated marine vinyl cleaners or diluted enzymatic sprays to preserve the material's lifespan.