So open it outside and let it air in the sun for an hour or two. Problem solved.
They would have cringed at some of the plastic molding toys I had as a kid.
Some people would likely faint in the presence of the smell a new vinyl product gives off.
Same people seem to be allergic to everything, including other humans, cats, dogs, grass, air, light, smoke, fire, water, milk, sugar, and salt.
Most people protect themselves from the ‘environment’ so much (Hepa Filtered AC, filter masks , etc.), that when they have to confront the environment, they have no built up defenses.
I say, if the vinyl curtain smell offends one’s sense of smell, get sliding glass doors on your shower.
Do you also remember how water tasted when you squirted it into your mouth from your water pistol on a hot July day?
Yucky but nostalgic.