Marvel Whirling Spray was a feminine hygiene product marketed in the early 20th century. It stopped being made and fell into obscurity for 100 years until the early 21st century, when it earned a place in comic-book history.
Alan Moore included a reprint of one of the Marvel Whirling Spray ads in an issue of The League of Extraordinary Gentlemen
(Vol. 1, #5). An executive at DC (publishers of the comic) saw the ad and became worried that their rival, Marvel Comics, would take offense — even though Marvel Whirling Spray was a real product that existed before Marvel Comics. So he ordered the entire print run destroyed. The few copies that survived are now considered rare collector's items. More details at recalledcomics.com