How to prevent / solve Dark jeans & fade lines

[NotDonna]

I have dark jeans for 5 minutes. Wash inside out, hang to dry yet they always have faded crease lines. How do I rectify this? Or prevent in the first place?

You could try soaking them before putting them in the washing machine. No idea if it will work but it's the recommend advice to stop this from happening to tencel fabric so it's worth giving it a go.