6 Degreasing Sprays For Hide Degreasing Old Farmers Swear By

You’ve spent hours skinning and fleshing that hide, and it’s finally looking clean. But as it dries, you notice dark, oily patches that just won’t go away. This is the moment every home tanner dreads, because that lingering grease is the enemy of a soft, supple, long-lasting tan. Getting the fat out of the skin is just as important as getting the fat off of it, and the right degreasing agent makes all the difference.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Why Proper Hide Degreasing is Non-Negotiable

Grease left in a hide is a quiet disaster. It prevents the tanning chemicals, whether it’s a salt-acid pickle or a brain tan solution, from penetrating the skin evenly. This creates hard, inflexible spots in the finished leather—a problem known as "grease burn."

These greasy areas will never tan properly. Over time, they can leach oil, creating a sticky, smelly mess that attracts insects and rodents. A poorly degreased hide will eventually stiffen, rot from the inside out, and fall apart, turning all your hard work into a wasted effort.

Proper degreasing ensures a uniform tan, a soft final product, and a hide that will last for generations. It’s not an optional step; it’s the foundation of quality home tanning. Think of it as preparing the canvas before you paint.

Dawn Dish Soap: The Gentle, Effective Standard

There’s a reason a bottle of blue Dawn is found in nearly every farmer’s workshop and barn. It’s a gentle, incredibly effective surfactant designed specifically to break down grease without being overly harsh. For most common hides like deer, rabbit, or squirrel, this is often all you need.

The process is simple. Fill a tub with warm, not hot, water and add a generous amount of Dawn until the water feels slick. Submerge the fleshed hide and agitate it every so often for a few hours. You’ll see the water turn cloudy as the soap pulls the oils out of the skin.

For a slightly greasy hide, one wash might do it. For something like a fall deer with a bit more fat, you may need to drain the dirty water, rinse the hide, and repeat the process. Dawn is the perfect starting point because it’s effective, cheap, and has a very low risk of damaging the hide or hair.

Simple Green for a Non-Toxic Degreasing Bath

When you need a bit more power than dish soap but want to stick with something biodegradable and relatively safe, Simple Green is an excellent choice. It’s a fantastic all-purpose degreaser that works wonders on moderately greasy hides like raccoon, fox, and coyote. It cuts through the slick, oily fat that these animals are known for.

Just like with Dawn, you’ll want to create a degreasing bath. A ratio of about one part Simple Green to ten or twelve parts warm water is a good place to start. Let the hide soak, agitating it periodically, for several hours or even overnight for a particularly greasy specimen.

The key with any commercial cleaner is a thorough rinse. After the hide is degreased, you must rinse it with clean water until you’re absolutely certain all the cleaner is gone. Any leftover degreaser can interfere with the pH of your pickle and hinder the tanning process.

Purple Power for Heavy-Duty Grease Removal

Now we’re getting into the serious stuff. Purple Power, or similar high-strength alkaline degreasers, are for the truly challenging hides. Think of a fat domestic hog, a prime winter beaver, or a badger. These animals have layers of deep, embedded grease that simple soaps won’t touch.

This is a tool, not a gentle bath. You must use it with caution. Always wear gloves and eye protection. Dilute it more than you think you need to—start with a 1:20 ratio with water and see how it works. A short soak of an hour or two is often enough.

The biggest risk with a powerful degreaser is hair slippage. If the solution is too strong or the hide is left in too long, it can damage the hair follicles and cause the hair to fall out. Monitor the hide closely. Pull on the hair periodically. If it starts to come loose, pull the hide out immediately and rinse it thoroughly.

Kerosene or White Gas: The Solvent Soak Method

This is an old-school method that still has its place, but it comes with serious warnings. Using a solvent like kerosene, white gas (Coleman fuel), or mineral spirits is less about washing and more about dissolving. The solvent penetrates the skin and chemically dissolves the fat and oil. It is incredibly effective on the greasiest animals on the planet, like bear and raccoon.

This is not a spray. The hide is submerged in a metal or solvent-safe container filled with the solvent for several days. The container must be sealed to prevent evaporation and, more importantly, to contain the highly flammable fumes. This must be done outdoors, far away from any potential source of ignition—no pilot lights, no smoking, no sparks of any kind.

After the soak, the hide is hung up to drip dry and air out for several days until all traces of the solvent smell are gone. Disposal of the used, fat-laden solvent is also a major consideration and must be done in accordance with local environmental regulations. This method works, but the fire risk and handling hazards are significant.

Borax and Water Solution for Natural Degreasing

For those looking for a more natural and gentle approach, a simple Borax and water paste or soak can be surprisingly effective. Borax is a naturally occurring mineral that acts as a mild cleaning agent and also helps to inhibit bacterial growth—a huge plus in the early stages of hide prep.

This method is best for very lean hides, like a summer squirrel, or as a pre-cleaning step on a dirtier hide before moving on to something stronger. You can either make a thick paste, scrub it into the flesh side, let it sit for an hour, and then rinse, or you can create a soaking solution in a bucket of warm water.

Don’t expect Borax to cut through the heavy grease of a beaver or bear. It’s not a heavy-duty degreaser. Think of it as a good way to clean and slightly degrease while also keeping the hide fresh before it goes into the pickle. It’s a safe, multi-purpose tool for the tanner’s arsenal.

Trisodium Phosphate (TSP) for Tough Bear Hides

When you’re facing the Mount Everest of grease—a big, fat fall bear—you may need to bring out the ultimate weapon: Trisodium Phosphate, or TSP. This is a powerful alkaline powder that, when mixed with water, creates a highly caustic solution that chemically converts fat into soap through a process called saponification.

TSP is not for the faint of heart. It is highly corrosive and requires full personal protective equipment: heavy-duty gloves, safety glasses, and good ventilation. A small amount, maybe a quarter cup in five gallons of water, is all you need. A soak of just a few hours can turn a greasy, impenetrable bear hide into a clean, white, receptive skin.

Like with Purple Power, the risk of hair slippage is very high. You must babysit a hide that’s in a TSP bath. Check it every 30 minutes. Once the flesh side feels clean and not greasy to the touch, pull it out and rinse, rinse, rinse. TSP is an incredibly effective tool for a very specific and difficult job, but it demands respect and careful handling.

Choosing the Right Degreaser for Your Hide

The best degreaser is simply the right tool for the job. Using a solvent on a rabbit hide is overkill, and trying to degrease a bear with dish soap is a lesson in frustration. The key is to match the strength of your degreaser to the greasiness of the animal.

Here’s a simple framework to follow:

• Lean Hides (Deer, Rabbit, Squirrel): Start and likely finish with Dawn Dish Soap.
• Moderately Greasy Hides (Fox, Coyote, Raccoon): Simple Green offers a good balance of power and safety.
• Very Greasy Hides (Beaver, Hog, Badger): Use a powerful alkaline degreaser like Purple Power, but with caution.
• Extremely Greasy Hides (Bear): The job may call for a specialist like TSP or the high-risk, high-reward solvent method.

Always start with the mildest option that you think might work. You can always wash a hide a second time or move up to a stronger product. You cannot, however, undo the damage from a chemical that was too harsh and caused the hair to slip. Assess the hide, understand the tool, and proceed with patience.

Ultimately, degreasing is about setting your project up for success. Whether you choose a gentle soap or a powerful chemical, a clean, oil-free hide is the only kind that will accept a tan properly. Taking the time to do this step right honors the animal and ensures the beautiful, durable leather you create will last a lifetime.