I've tried some of these techniques, but certainly not all of them. Use these techniques with care as many of them can harm a pony if done incorrectly. I am not personally vouching for any of these restoration techniques and do not claim to be a particularly good restorer myself. I simply support pony restorations and hope to continue to get better at it.
Remember, no one knows the long term effects various chemicals may have on ponies. Use chemicals, even gentle ones, with caution.
Research what you're doing and don't be afraid to try things on fakies or baits as needed. Also, be willing to learn from the mistakes other collectors have made. They're amazingly willing to share!
Or, best of all My Little Wiki where you can find links to all the hot spots in Ponyland. And may I not so humbly mention, my site is listed there as well! They have a nice definition of a "Bait" pony, a list of ponies they recommend not be customized, and a list of ponies commonly known to have issues: Bait.
Here is general information to get you started with pony restoration. Please e-mail me if you know of restoration techniques that you think should be added to the site. Prevention tips are always welcome too!
Many of the materials you'll find discussed on this site are harsh and quite toxic. Please wear latex or rubber gloves while using them and keep them away from children and pets. Use caution while using sharp objects and glues. Contact your city or county to find out how to properly dispose of left over chemicals. You should never dump chemicals down the drain.