Has anyone tried out any of the Twin Pines of Maine products other than Remove-Zit?
http://www.twinpines.com/They seem to really know what they're talking about and I bet a lot of these products would be good for ponies. I'd like to get their book eventually. They give a clear warning about using Remove-Zit on dyed vinyl (which is what ponies are). I don't think this necessarily means that none of their products would be safe for dyed vinyl.
"Most vinyl plastics are normally colored by adding metal oxide pigments to the plastic mass before it is molded. When vinyl compounds colored in this way are treated with REMOVE-ZIT to remove a stain the pigment is not affected by the treatment and the stain is removed.
Another way to color some vinyl compounds is simply to add a dye to the plastic mass before it is molded. When vinyl compounds colored in this way are treated with REMOVE-ZIT the stain is removed but in many cases so is the dye used to color the vinyl. Strictly speaking, a dye is a stain and REMOVE-ZIT is an efficient stain remover."