Man you got me.

I was like "wtf this stuff are proteins? "

But then:

WD-40's formula is a trade secret. The original copy of the formula was moved to a secure bank vault in San Diego in 2018.

To avoid disclosing its composition, the product was not patented in 1953, and the window of opportunity for patenting it has long since closed.

WD-40's main ingredients as supplied in aerosol cans, according to the US Material Safety Data Sheet information, and with the CAS numbers interpreted:

• 45–50% low vapor pressure aliphatic hydrocarbon (isoparaffin)
• <35% petroleum base oil (non-hazardous heavy paraffins)
• <25% aliphatic hydrocarbons (same CAS number as the first item, but flammable)
• 2–3% carbon dioxide (propellant)

Sourche wikipedia (i know we are here in a science community but its fucking early here)