Question: here are 20 little-known ways that wd-40?
Answer: Repel hard water stains. (Image source: nearsay.com) ... 
Slide off stuck jewelry. (Image source: onthebright.com) ... 
Spruce up fake foliage. ... 
Remove paint from hands. ... 
Keep your gardening tools clean. ... 
Shine up your souvenir seashells. ... 
Remove crayon and marker from walls. ... 
Make stiff leather more flexible.