Grease, Oil and Metalworking Fluid: Cleaning Shop Hands Without Solvents

October 12, 2026Hand & Skin Care6 min read

Machinist in safety glasses washing oily hands at a shop sink under a wall-mounted dispenser, CNC machine behind

Machinists, maintenance techs and press operators spend the shift with their hands in it. Coolant on the parts. Way oil on the machine. Grease on every fitting. By break time your hands are slick and dark, and by Friday the skin on your fingers is rough, red and splitting.

Metalworking fluid dermatitis is one of the most common skin problems on a shop floor, and grease isn’t far behind. Here’s what they do to skin, why solvent cleanup makes it worse, and a simple routine for cleaning up shop hands.

What metalworking fluid does to skin

Metalworking fluids (MWFs) cool and lubricate the tool and the part. They’re mixes of oils, water, emulsifiers, rust inhibitors and biocides. They get on your skin from the parts, the tools, the machine and the mist.

NIOSH says workers exposed to MWFs often report skin problems: irritation, oil acne and rashes. The most common are irritant and allergic contact dermatitis. There’s no exposure limit for skin contact, so NIOSH’s advice is simple: limit skin contact to prevent irritant and allergic skin reactions.

Coolant is the big one. In a NIOSH evaluation at a rifle barrel plant, workers whose skin touched coolant had significantly more work-related dermatitis than workers whose skin didn’t. NIOSH also notes that over 80% of work-related contact dermatitis involves the hands.

Why solvent cleanup backfires

Grease and fluid don’t rinse off with water, so a lot of shops end up with a can of solvent or a rag soaked in parts cleaner by the sink. It works because it dissolves oil.

The problem is that it dissolves your skin’s oil too. Think of the outer layer of skin as a brick wall. The cells are the bricks, and natural oils and lipids are the mortar that holds moisture in and keeps irritants out. Solvents wash out the mortar. Then the next round of coolant gets in more easily, and the skin cracks.

NIOSH’s guidance in its field reports is direct: wash contaminated skin with soap and water, and don’t use solvents to clean your hands.

Cleaning up shop hands

You need a cleaner strong enough for grease that doesn’t rely on solvents. I.C. Heavy Duty Hand Cleaner is a pumice scrub that strips tar, oil, grease, carbon and adhesives. It’s solvent-free, silicone-free and alcohol-free, and benzalkonium chloride kills 99.99% of germs. Silicone-free matters in shops that paint or coat parts, where silicone on hands can cause finish defects.

One thing to know: it has a light lemon scent. NIOSH names fragrance and lanolin as known allergens that can cause allergic contact dermatitis in sensitive people, and advises picking soaps and moisturizers that avoid known allergens. If you know you react to fragrance, use a fragrance-free cleaner instead, such as I.C. Antibacterial Hand Cleaner, for everyday washing.

The routine

Gloves off, rinse. Rinse loose fluid off under running water.
Scrub. Work the heavy duty cleaner into your hands, around the nails, between the fingers and up the wrists. NIOSH suggests washing hands and arms up to the elbows when fluid gets on your forearms.
Rinse well. Leftover cleaner can irritate too.
Dry with a clean towel. Not the shop rag in your back pocket.

Put a 32 oz refillable wall dispenser at each utility sink. It holds hand cleaners and lotions, comes in manual and touch-free automatic models, and has a lock to keep it from walking off. When the cleaner is right at the sink, people use it instead of the solvent can.

Take care of your skin after the shift

NIOSH’s prevention advice includes washing in lukewarm or cool water instead of hot, patting hands dry, and putting on moisturizer generously after washing. Here’s how to fit that in:

On the floor: if you glove up, a light lotion made for use under gloves, one without silicones, lanolin or mineral oils, so nothing ends up on the parts. Follow your plant’s contamination rules.
After the shift: once you’re off the floor, I.C. Advanced Repair Hand Cream. It’s a dimethicone skin protectant that helps prevent and temporarily protects chafed, chapped or cracked skin, and it’s fragrance-free. Because dimethicone is a silicone, keep it off the line and use it at home or after your last wash.

Cut the contact at the source

The best fix is less fluid on your skin to begin with. NIOSH’s field reports recommend better handling practices, consistent glove use and not spraying fluid or air around the machine. On the floor, that looks like this:

Use tools, not bare hands, to handle wet parts.
Wear gloves rated for the fluid you use. Ask your safety lead which ones.
Don’t blow parts off with compressed air. It spreads mist onto you.
Keep fluid maintained. Follow your shop’s fluid management plan and the maker’s instructions for changing and treating coolant.
Don’t keep oily rags in your pockets. They hold fluid against your skin all day.

What to watch for

NIOSH says to report early signs of skin trouble to your supervisor, because acting early can head off worse problems. Watch for:

Red, itchy or scaly skin on the hands, wrists or forearms.
Small bumps or pimples where fluid soaks your sleeves (oil acne).
Cracks that bleed or won’t heal.
A rash that flares every time you work a certain machine or fluid.

If it doesn’t clear up, see a clinician and tell them what fluids you work with.

For more on hand care on the production floor, visit our general manufacturing page and the manufacturing Field Notes.

FAQ

Can metalworking fluid cause a rash?

Yes. NIOSH says skin contact with metalworking fluid is most often linked to irritant and allergic contact dermatitis, and workers often report irritation, oil acne and rashes.

What’s wrong with cleaning my hands with parts cleaner?

Solvents strip your skin’s natural oils along with the grease, which leaves skin dry and cracked. NIOSH advises washing with soap and water and not using solvents on your hands.