White fridge door turned yellow!!?

I've recently moved into an apartment where the fridge is fairly old and the white finish is now patchy and a kind of a yellow/beige colour. I tried scrubbing it with a bleach spray to no avail, is there anything I can try that would restore the white finish or is it simply just down to the age of the fridge? It makes the kitchen look very dingy and I'd really like to brighten it up! Don't want to by a new fridge as I'm only renting and the landlord won't replace it as it works fine.