Tell her to ditch that shi* and get 303 Aerospace Protectant.
303 Products, Inc.: 303 Aerospace Protectant
It actually protects the tires from rotting and from sun damage. You can use it on lots of stuff too, we used to use it on a bunch of stuff around the house, kept our leather spa cover nice in the arizona 100+ degree weather.
and by the way, its SHINY not shinny, unless you're using your shins for tire shine, which sounds painful and ineffective.