Chucky Doll Rehaul Advice

I'm currently in the process of rehauling my TOTS plush Good Guy Doll, and was wanting to ask for help regarding a few things.

I mainly want to know some methods on how to remove the glue residue from the head after removing the wig, and recommendations on a good clear gloss/varnish spray that I can use to give him some shine.

Lastly I welcome any other advice that I could use as this is my first time trying something like this, and I want to make it as good as I possibly can.

Thanks!