I washed mine with good results. And hung to dry. Mine is an 82 Scamp
so the fabric is likely different. I would imagine they have also seen a lot of sun. I can't say if they are original, but everything else was when I bought it so I'd guess they were (plus they look 1982-ish. If that makes any sense).
Curtains from a newer popup that my sister and I shared came out of the wash MUCH shorter and narrower....very different fabric.