Have you ever bought fabric that had a seemingly permanent crease in it? Or you've had some fabric sitting around folded for so long that you can't seem to get the crease from the fold out? Never fear, there may* be hope.
Dilute 2 TBSP of white vinegar in 1 cup of water (or in my case use straight vinegar), spritz that on the fold or dab it on with your finger depending on if the fabric will water mark with a spray. Using a hot iron, iron the fabric. The steam and vinegar should help you out quite a bit. Be sure to do a test on a scrap or in an inconspicuous place to see how the fabric will react to the vinegar.
Here's my culprit. 100% Silk Dupioni. MAJOR crease right down the middle of the fabric.
Before. (after using only steam many, many times)
Did you notice that I said I used straight vinegar on 100% silk?!! YIKES I can't believe I actually got the gumption to try it, but I guess it's like they say, 'desperate times call for desperate measures'. Thankfully it helped enough.
*This trick may help you, but some creases like the one on my silk, just aren't going to come out. It is much better, but it is still faintly there.