First, you will be amazed what will come off when you get some baking soda and mix it with water until it's pasty, then take a face cloth and gently rub the paste over the pony, scrubbing where needed, and rinsing with warm water.
Party Time has regrind - very common to her! Basically they shaved two batches of plastic together and then melted it and re-cast it. So the dyes start moving around and there you have it, regrind.
So there won't be much you can do to stop the color-change - think of it as her special magical power.
You can alleviate the stickiness that occurs on the surface of the vinyl with Dawn or another dishwashing liquid soap.
Plenty of G1s have some kind of symbol scuff or mark - on Peachy, who is drop-dead common, it really doesn't affect her value.
The brown spot on her is likely remnants of "pony cancer" - you can spot treat with bleach/peroxide/OxyClean, then sunfade the stain out, or sometimes lift it out of the plastic after you have sterilized the area. Keep in mind that the vinyl is porous and the cancer may be in one of the many layers beneath the surface but still visible. Or the treatment may leave a pindot "pockmark" where the vinyl pore was actually cleansed of a blockage. She looks good, though! Give her a good scrub and she'll be very pretty again.
Majesty tends to have those discoloration issues, but you can attempt to even them out with sunfading or peroxide. Tail rust is easy to treat, though. Rub some whitening toothpaste into the fibers and it will remove the rust. You may want to replace the clamp and washer too, but that's up to you. If you like styling your ponies a LOT, I'd recommend it as they will encounter water more often. Dry, display ponies in ideal storage conditions might not need it BUT it depends on your region - humidity and such.
Hope that helps!
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