Someone said I could clean my front door with WD40 - how?!

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What kind of door do you have (wood, metal, plastic)?
I think this is what you saw - good advice here! https://www.hometalk.com/diy/clean/house/how-to-easily-clean-your-front-door-back-to-new-again-28647313
How To Easily Clean Your Front Door Back To New Again!
Spray it on and wipe it off with paper towels or I prefer a soft cotton rag that leaves no lint behind.