The trivia for this is wrong

It was the perfume called "sex pot" that made her shrink. Several other people came into contact with the other 2 things you mentioned and it never affected them.

Hello. My name is Inigo Montoya. You killed my father...prepare to die!

I seem to remember the cause was specifically more than one substance. Even though it's been decades, I saw this movie countless times in the 80's. I also remember laundry detergent being part of it.

It was an overall exposure to many different chemicals. I’m watching it now. From the beginning she is exposed to tons of things starting at the grocery store.

I’m watching this now and the hospital where she goes for all the test they concluded that she is shrinking from a combination of tap water, flu shot, the perfume, the glue, the solvent (glue), her bubble bath, talcum powder, shampoo, hair conditioner, setting lotion, hand lotion, mouthwash, hair spray, breath spray, feminine hygiene spray, deodorant, toothpaste, detergent, eye drops, nose drops, hair coloring, diet soda, birth control pills and smog. Set off an imbalance already in her system.

I typed all that as the movie played in captions.