Boba Ben
Super Freak
A friend of mine has a 12 inch Mego Admiral Kirk from Star Trek the Motionless Picture.
He has kept it packaged since it was released, only taking it out of the box a few times. Despite this, the rubber head has turned green and is tacky to the touch.
So, if you want to keep your collectables nice forever the only solution is to sacrifice a virgin to appease the gods.
Suicide is never the answer.