my latin shoes are well-loved and i'd like to make them look more lovable. they're tan satin with rhinestones along every strap, so the rhinestones have kept the straps looking fine. I try to only wear them for comps, performances, or if I know I'm only dancing rhythm that day. The satin on the heel looks fine because of that. The soles are turning dark and icky though. I've heard of washing them with a cloth soaked in woolite. any suggestions to make the soles pretty again?