I hate slime all over my new curtains!!!!

[kissmelittleass]

Anyone know how to remove this freakin' slime? Homemade by the kids and a lovely handprint on curtains and then they tried to rub it in so a lovely big patch of bright coloured slime.
Was done yesterday didn't see till this morning, have tried white vinegar and rubbing it with hand wash but no good, have put in wash but still there!!
Any slime experts out there ? My usual motto is life's too short sling it but curtains are new just a few months old,, velour material.

Will it scratch off?

@candlemasbells no there's no bits or gloop it's just dried in , made with kids paint washing detergent and pvc glue

There's a product called Goo Gone, you could try that?

What did they colour it with?
I thought vinegar was supposed to work? Did you try soaking it?

Hi yes I did try soaking in white vinegar for about half an hour but didn't work!
Just found out though that dh seen it this morning before he went work and tried to wipe it off with baby wipes so that's why it was spread out as he had rubbed it in grrrr!!
The stain has gone through to the white lining leaving a big yellow stain like as if it's been discoloured by the sun!
Dh has made it worse!!