Fly Season Horse Grooming: Wash First, Spray Second
Fly season care really begins at the wash bucket, not the spray bottle. Ferro's Repel Oil Shampoo is a botanical bathing wash — citronella, lemongrass, eucalyptus, and tea tree — that leaves your horse clean and noticeably less appealing to insects right after turnout. It's a shampoo, not a leave-on repellent. Treat it as the first layer, then pair it with a dedicated fly spray for hours of real cover.
Why washing matters during fly season
Sweat, dust, and a film of manure on the coat give flies more surface to land on and a stronger scent trail to follow. A weekly wash with Repel Oil Shampoo clears that film away and leaves behind a light botanical scent — citronella, lemongrass, eucalyptus, tea tree — that horses handle fine and flies don't. Because it's oil-based, it cleans without stripping the coat bare the way a harsh detergent would.
- Wet the coat fully before you apply it.
- Work it into a lather, focusing on the legs, belly, and under the tail — the spots flies gather most.
- Let it sit two to three minutes, then rinse clean.
- Towel dry, then turn out or follow with a leave-on repellent.
When it's more than just flies
Constant tail rubbing, hair loss along the mane and tail, or hives that show up during fly season can point to sweet itch instead — an allergic reaction to insect bites that needs a vet's management plan, not a different shampoo. Routine washing supports healthy skin and can ease irritation from grime, but it won't treat an allergic condition. Suspect sweet itch? Loop in your vet before you change anything about the grooming routine.
A season-long routine matters more than any single product ever will. See our summer fly grooming guide for a complete washing and repellent schedule, or check homemade fly spray recipes if you'd rather DIY the leave-on layer. Most owners wash more often at the height of summer, then taper off once fly pressure drops in fall.
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Frequently asked questions
Is Repel Oil Shampoo the same as a fly spray?
No. It's a botanical bathing shampoo — you wash it in and rinse it out, not a leave-on repellent. Use it to start clean, then add a leave-on spray for cover that lasts all day.
How often should I use it in fly season?
Most owners wash it in weekly, or after a heavy sweat, and lean on a leave-on repellent between baths so the coat doesn't get over-washed.
Will this treat sweet itch or bite allergies?
No. Sweet itch is an allergic condition, and it needs a vet's diagnosis and a management plan. Grooming supports healthy skin, but it doesn't treat an allergy.
Is the scent strong or overpowering?
There's a noticeable botanical scent from the citronella, lemongrass, eucalyptus, and tea tree, but it fades within a few hours of drying.