WD40 in aerosol cans costs approx $1/oz.
In gallon cans it costs approx half that.
I use it because it’s a clean solvent with a pleasant aroma. I use it instead of liquid soap in a bucket of water using a mop to wash my aluminum airplane. I haven’t had to re-polish that airplane in 24 years of ownership.
But there’s another solvent that may be similarly efficient at cleaning up grease and grime and costs about 5-cents per oz.
Diesel.

In gallon cans it costs approx half that.
I use it because it’s a clean solvent with a pleasant aroma. I use it instead of liquid soap in a bucket of water using a mop to wash my aluminum airplane. I haven’t had to re-polish that airplane in 24 years of ownership.
But there’s another solvent that may be similarly efficient at cleaning up grease and grime and costs about 5-cents per oz.
Diesel.
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