Greasy hinges and stubborn bolts practically beg for a blast of WD-40, and millions of Americans keep that blue-and-yellow can within arm’s reach for exactly that reason. The product works wonders on squeaky doors, rusty tools, and sticky hardware, but plenty of people treat it like some magical cure-all for every problem in the house. That habit creates expensive mistakes faster than most homeowners realize. WD-40 contains solvents and lubricants that break down grime, yet those same ingredients can also damage delicate finishes, dry out materials, and interfere with electronics.
A quick spray in the wrong spot can turn a tiny annoyance into a repair bill that wrecks the weekend budget. Before that familiar can comes out again, homeowners should know which household items deserve a very firm “hands off.”
