Lining the bottom of the fridge?

  1. The bottom shelf of my fridge is a mess and it is not cleaning well. Is there something I can line it with to cover up the mess down there? It's the bottom shelf-so, it isn't a wire shelf-it is the white plastic-you know what I mean?

    i googled and didn't find anything.
  2. What sort of mess and what have you tried to clean it with?