>>6277897Depends on the wig, but if it's a heat resistant one or one made of natural fibers (which behaves more or less like human hair), yes.
You can gently poor warm water on it or even use a straightening iron, just make sure to take it slow and don't bump up the heat right away. Test first how the hair behaves on lower temperatures and then slowly go higher.
>>6277652Hm, do you have a picture anon?
Usually while removing staining does not happen, since stains need some time to form. It might be that the stains were already there and you just made them visible by removing the paint on top.
Is the surface the stains are on completely smooth? Since you sanded them I assume yes, i.e. it's definitely not caked on residues.
If you can't even sand them out I fear you are doomed.
Is the head resin? If it's vinyl you might still have a chance with some oxy paste (look up tutorials on how to remove vinyl stains).
I sadly have no clue if it works on resin too, none of my resin dolls was ever stained.