Tips to rejuvenate a doll’s wig?

Hi, y’all. So, I’ve had Boxer’s famous anime looking wig for awhile now, and it‘s starting to show its age. The bottom of it is getting frizzy and kinda tangled, and it’s overall not as soft as it used to be when I first bought it, even when brushing it. I really like the wig and would like to salvage it if I could, but I’m not sure what I can really do about it. I was thinking of boil washing it like I’ve done with my Bratz dolls’ hair- which have worked well on them- but a life sized wig might be a bit more challenging. Tips are appreciated. 🙏