I’ve been seeing advice online recently telling people to spray WD-40 to get rid of carpenter bees. While it might sound like a quick, clever hack, it doesn't solve the problem long-term — and worse, it can stain your wood and harm beneficial garden pollinators.

Unlike honeybees or bumblebees that live in social colonies, carpenter bees are solitary insects with a destructive habit: boring perfectly round holes into exposed outdoor wood to nest. While they don't eat wood like termites do, their tunneling in decks, fascia boards, and porch railings can weaken structural timber over time and leave unsightly yellow stains along entry points.

If you prefer a gentler approach that won't harm pets, children, or local wildlife, a peppermint-based spray is the best natural deterrent. Carpenter bees have highly sensitive scent receptors and despise these strong, localized odors.

Here's exactly why that viral WD-40 trick fails, how to make the DIY spray, and the best way to apply it for maximum protection.

Spraying WD-40 into carpenter bee holes is one of the most common internet myths circulating today. While the solvent might temporarily kill a bee on direct contact, it fails entirely as a long-term deterrent.

WD-40 dries quickly, leaving behind a slick residue that fails to repel future bees. Worse, spraying petroleum-based lubricants onto raw, weathered wood can stain your deck, break down protective wood sealants, and leach toxic chemicals into nearby soil and garden beds. Relying on WD-40 leaves your home exposed while risking unnecessary environmental harm.

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