My son buys that **** by the gallons. He sprays it
all over his dirtbike after he washes it. It makes
it easier to get the dried mud off the next time.
WD40 was and may still be a big supporter of
amateur MX. When my son was racing they would send
him a case every year just for the asking. Just
like drug dealers do. They got him hooked on the
stuff now he still uses it all the time.

Formula car racers hose down all the suspension and running gear with
WD40 after a rain session. Chases the water out and cleans the car,
makes it shed water better in the next session, reduces the opportunity
for rust to start in the crevices.