Yeah, that scene is strangely the most disturbing one in the film for me. I remember it vividly, far more than the giant screaming sperm.
Didn’t see this thread until now. Just get a steamer. I have no idea how to iron but the steamer gets out 95% of wrinkles.
The trick is to leave the iron in one spot and let it do its thing. Very little manual intervention required.
(No I’m lying. Don’t do this.)