Marked Sleeves? Are they fixable?

[Vvk]

So I screwed up some of my sleeves. They got crinkled. I'm wondering if there's a known way to fix them? Like ironing them straight or something? They're only plastic-type stuff, so it seems logical. The internet hasn't provided me any help on the matter, so I turn to you guys. I don't need them clean, per-se, just flat again. If it was only three or so of em, I'd just toss them. But I'm sitting on about 20 marred sleeves. :(

Also; grundgy post-sick face.

[Elnath]

Can't say I've ever bothered trying to fix them, but try warming them with a hair dryer, sandwich them between something hard like plastic or wood. Then set a nice heavy book, preferably someone's complete works anthology, on top.

[Zen]

They are thin, cheap plastic, so ironing would not be a good idea. They would just melt.

You could try putting a card-sized piece of thin cardboard in them and leave a very heavy book on it for a couple of days, it might straighten them out. No promises as I've not actually tried this on sleeves, but it might work in theory.

Otherwise, I think you are out of luck, sadly, but I've not tried to unmark sleeves like that.