yeah you hardly use the rear wiper that's why the rubber spoil already la. do you lift it up when you park under the sun or not?
Anyway to solve all your problems, get a wiper which uses silicon blades rather than rubber. I know 2 brand that uses silicon. 'Dura Edge' sells 1 piece for more or less RM20 depending on length. It comes with lifetime warranty, silicon blades. Sure no sound, no problem wan.
The other chun brand wiper i've seen is 'PIAA' it's made of carbon fiber for the whole thing and silicon blades as well. There's no lifetime guarantee here but the silicon blades can be refilled w/o buying the whole wiper. This wiper costs RM100 per piece.