How to Get Feces Out of Baseball Caps: Tested 2026 Guide

By Amara Johnson · November 11, 2025

Immediate Action (first 5 minutes)

Last month, my 14-month-old son had a massive diaper blowout right as I was leaning over the changing table wearing my favorite $45 New Era 59FIFTY fitted cap. The splash zone caught the back panels and the brim. I panicked. Feces is a biohazard, and it stains cotton aggressively if you let it sit. If you're reading this right after a similar disaster, stop scrolling and act immediately.

Scrape it. Use a dull edge. I prefer the back of a butter knife because it won't slice the delicate cotton threads. Lift the solid matter off the fabric without pressing it deeper into the weave. Hot water is your enemy here. Feces is packed with proteins. If you use water over 80°F, those proteins coagulate and bind permanently to the fabric. Run the stained area under cold tap water (ideally between 60°F and 70°F) from the inside out. This pushes the stain out of the fibers rather than driving it deeper. Don't rub it. Just let the cold water flush the area for a full two minutes.

What You'll Need (tools/products)

You can't just throw a structured hat into the washing machine with regular Tide. The agitation will crush the crown, and standard detergents lack the specific enzymes needed to break down uric acid and skatole (the compounds that make feces smell so awful). I've tested dozens of products over my years restoring hats, and this specific lineup works best for bio-stains.

Product	Purpose	Price Range
Nature's Miracle Stain & Odor Remover	Enzymatic breakdown of bio-matter	$10-$15
Dawn Platinum Powerwash Dish Spray	Lifting residual oils and fats	$5-$8
Jason Markk Premium Standard Brush	Safe agitation for cotton/wool	$18-$22
Distilled White Vinegar	Neutralizing alkaline odors	$3-$5
Microfiber Towels (300 GSM)	Moisture extraction without lint	$15-$25 (pack)

I'll be honest, this takes elbow grease. You can't just spray and walk away. The Jason Markk brush is crucial because its synthetic bristles are stiff enough to work the enzyme cleaner into the cotton twill, but soft enough that they won't cause pilling on wool panels. This isn't the cheapest option, but spending $20 on a proper brush saves your $40 hat from looking fuzzy and worn.

Step-by-Step Removal

Before we start, you need to know what your brim is made of. Tap the brim against a hard table. If it makes a dull thud and bends easily, it's cardboard (common in vintage caps made before 1983). If it snaps back and sounds hollow, it's plastic. If you have a cardboard brim, do not submerge the hat. You must spot-clean only. For modern plastic brim caps, you can be a bit more aggressive with moisture.

Step 1: The Colorfastness Test

Dip a cotton swab in cold water and a drop of Dawn Platinum. Rub it on a hidden area of the hat, like the inside sweatband. Wait 60 seconds. If the dye transfers to the swab, your hat isn't colorfast. You'll need to use minimal moisture and blot instead of scrubbing to prevent the colors from bleeding into each other.

Step 2: The Enzyme Application

Lay the hat on a clean, dry towel. Saturate the stained area with Nature's Miracle Stain & Odor Remover. Don't be shy with it. The enzymes need to penetrate deep into the cotton twill to reach the proteins trapped in the weave. Let it sit for exactly 15 minutes. If you let it dry out, the enzymes stop working. If it starts to dry, mist it with a little cold water.

Step 3: Targeted Agitation

Take your Jason Markk brush and dip the tips in a 50/50 mix of cold water and Dawn Platinum Powerwash. Scrub the stain using tight, circular motions. Work from the outside edges of the stain toward the center. This prevents the feces particles from spreading to clean fabric. You'll see brown suds forming. That's the enzymes and surfactants lifting the waste out of the fibers.

Step 4: The Blot and Rinse

Grab a dry microfiber towel and press it firmly into the suds to extract the dirty liquid. Don't wipe. Wiping smears the stain. Once you've blotted up the majority of the suds, rinse the area. If you have a plastic brim, hold the stained panel under a gentle stream of cold water. If you have a cardboard brim, use a damp microfiber cloth to repeatedly dab and lift the soap out of the fabric until the water runs clear.

Step 5: Odor Neutralization

Feces leaves behind a lingering smell even after the visible stain is gone. Mix one part distilled white vinegar with three parts cold water in a spray bottle. Lightly mist the cleaned area. The acetic acid in the vinegar neutralizes the alkaline odors left by the bio-matter. Let it sit for 5 minutes, then blot it dry with a fresh microfiber towel.

Step 6: Reshaping and Drying

Never put a wet hat in the dryer. The heat will melt the buckram (the stiff mesh inside the crown) and shrink the cotton. Find a 32oz coffee can or a large balled-up towel. Stuff it into the crown of the hat to push the panels back into their original dome shape. Place the hat in front of a standard box fan on medium speed. It will take 24 to 36 hours to air dry completely. Don't wear it while it's damp, or the sweatband will stretch out of shape.

Alternative Methods

Sometimes the stain is old, or you're dealing with a specific fabric type that doesn't respond well to the standard enzyme soak. Here are three backup methods I keep in my arsenal.

Method 1: Hydrogen Peroxide and Baking Soda (For White Caps Only)

If your white cotton cap has a stubborn, set-in yellowish-brown ring, enzymes might not be enough. Mix two tablespoons of 3% hydrogen peroxide with one tablespoon of baking soda to form a thick paste. Apply it directly to the stain and let it sit for 30 minutes. The peroxide acts as a mild, color-safe bleach that oxidizes the organic compounds. Scrub gently with a soft toothbrush, then rinse with cold water. Never use this on colored hats, as the peroxide will strip the dye and leave a permanent bleached spot.

Method 2: Folex Instant Carpet Spot Remover

This sounds crazy, but Folex is a secret weapon in the hat restoration community. It's a water-based, non-ionic surfactant that doesn't require rinsing. If you're dealing with a cardboard brim vintage cap where you absolutely cannot use excess water, spray Folex directly onto the stain. Agitate with a dry brush, and immediately blot with a thick stack of paper towels. The surfactant encapsulates the dirt particles, allowing the paper towels to wick them away without soaking the cardboard underneath.

Method 3: Professional Hat Restoration

If you're dealing with a rare vintage cap, an autographed hat, or a high-end wool fitted cap that costs over $100, don't risk it. Take it to a professional. Services like Hat Club or specialized local dry cleaners offer hat restoration for $20 to $35. They use specialized steam blocks and commercial-grade ozone chambers to kill bacteria and remove odors without compromising the structural integrity of the hat. It's an investment, but it's cheaper than ruining a prized collectible.

Prevention Tips

Dealing with bio-stains is a nightmare. Preventing them is much easier. If you have kids who track mud everywhere or a dog that thinks your hats are chew toys, you need a better storage system.

Ditch the floor: Never leave your hats on the floor or the bottom of your closet. Dogs love the smell of your sweat, and if they step in yard waste before laying on your hat, you're in trouble. Use an over-the-door hat rack. I use the $15 IKEA SLÄKT rack, which keeps my caps elevated and out of reach from my golden retriever.
The Diaper Change Rule: If you're a parent, take your hat off before changing a diaper. It sounds obvious, but when you're sleep-deprived at 3 AM, you forget. I keep a dedicated hook on the wall right next to my changing pad specifically for my hat and keys.
Pre-treat with Fabric Guard: Spray your clean hats with a water and stain repellent like Scotchgard Water Shield. It won't stop a direct hit from a blowout, but it gives you a crucial 30-second window where the liquid beads up on the surface, allowing you to wipe it off before it soaks into the cotton.
Wash your sweatband: Feces isn't the only bio-hazard. Your sweatband absorbs dead skin and oils, which attracts bacteria. Wipe the inside band down with a 70% isopropyl alcohol wipe after every heavy wear to keep the hat sanitary.

FAQ

Can I put my poopy hat in the washing machine?

Don't do it. The agitation will warp the crown, and the heat will melt any glue holding the brim together. I ruined a $35 Dodgers cap this way before I knew better.

Will bleach ruin my colored baseball cap?

Yes, chlorine bleach will strip the dye and weaken the cotton fibers. If you have a white cap, use oxygen bleach like OxiClean instead, which lifts stains without destroying the fabric.

How do I know if my hat brim is cardboard or plastic?

Tap the brim against a hard surface. If it makes a dull thud and bends easily, it's cardboard. If it snaps back and sounds hollow, it's plastic.

Why does the stain smell even after washing?

Feces contains uric acid and proteins that bind to cotton fibers. If you used hot water or standard laundry detergent, you likely baked the proteins into the fabric, trapping the odor.