Thanks for the advice about the wig shampoo! It never even occurred to me before, but that's a great idea! I actually have a few really expensive Nirvana ponies that could do with a bit of a wash, but I was concerned about using my usual cheap shampoo on them.
You are right about the Piggy ponies! I had intended to just get this one. I'll sometimes get an example pony of a very expensive line, just to have one. Plus I have all the Piggy outfits, and no pony that the shoes will fit:p However, after getting my hands on one in person for the first time, I'm having that familiar pony "want more - lots more" craving. Hopefully I'll be able to resist...for a while:p
Thanks for the warning! I've never gotten the hang of beheading any pony, so I don't do it. If the head isn't already completely loose, I never touch it. I tried to fix a TAF Baby with tail rust once, and I ended up tearing the neck pretty badly. Since then, I just do surface cleaning. It's good to know in the future if I ever end up with another Piggy with more issues though.