WD40 is 50-60% stoddard solvent/mineral spirits and 15-25% mineral oil... Hence a solvent base and should be cleaned off with at least car wash to avoid it sitting on the paint, and then waxed over. If you don't wax in the first place there's not much sense.
While WD40 is a phenomenal product, a $6 Quart of mineral spirits will do a better job cleaning, no oil or propellants, and it'll outlast every colorful spray can you'll ever own for 1/10 the cost, because the base for half of them is... Tada...mineral spirits or similar solvent, the rest of them are alcohol based.With a few exceptions being citrus and other petro's.
In case anyone doesn't want to guess what 90-95% of goo gone is/hydrotreated light spirits / aka / mineral spirits /refined petrochemicals.. "gas" and then some smelly stuff.. I still own it too some things seem to work better but there's no secret that they're all just refined crude.
2000 WJ 5.2 V8 4x4...yup
2011 WK2 V6