For pindot mold, add a scoop of oxy clean into a pot of water and boil it until the foam almost goes over the top of the pot or until the water appears to be boiling.
Remove the pot from the stove and put it into the sink.
Take the pony's head off (so the water goes in and OUT easily) and drop the pony into the pot. (You can also take out the pony's tail since there's no need to boil that.)
Cover it and wait for it to cool down enough that you can touch the water. (
BE SURE YOU ARE WEARING GLOVES!! OXY CLEAN IS AWFUL ON THE SKIN!!!)
Pour some dish soap (preferably antibacterial but doesn't need to be) on the area where the pin dot mold is and scrub it for a while with a toothbrush or a sponge that has a scrubbing side and it should come off rather easily. Hope this helps!!
Also should note that oxy clean tends to make pony hair dry and frizzy so be sure to wash it *completely* off the pony and have some conditioner ready for fixing the dryness.
Boiling ponies in oxy clean a few times is also good for whitening. It takes several boils, but the results can vary from a huge difference to minimal difference. Depends on the pony I guess!