Over the years WD 40 has been changed but is still basically Stoddard Solvent. 50 years ago it was big stuff but as a Penetrant it has been superseded by many other products. Environmental considerations have changed most every item that we might use to degrease a part. Ultrasonic Cleaners do a nice job and are available at Harbor Freight for less than $100. A CR favorite is your Dishwasher but it would take a very understanding Partner to actually use it for degreasing old parts. I always recommend you think long and hard before using Flammable chemicals for cleaning as you are apt to burn down your house or garage.
EASY DOES IT BOB FREITAS MILL VALLEY, CA USA
Time to call the Battleground