Trappers typically rely on scentless traps. Traps with a scent, like oil, might draw an animal to the wrong spot for a proper catch, or drive them away.

Before the new season, trappers typically clean traps, and boil them with a logwood dye, or use a dip to keep them clean, scentless and effective. In colder areas, a coat of wax might be used, as well.

Sorry for the details. Probably out of bounds and TMI for BF.