Need for repair

When we got this apartment almost two years ago, we had shower faucets installed so our baths will be more pleasurable. Unfortunately, something happened and it got really stained and we don't know how to remove the stains. It's really not a good thing to look at, with molds and dark stains all over the faucet. We tried removing it with cleaning detergents and bleach powder but nothing worked. We were thinking of have it removed and re-install another but then again, since the apartment is not ours, I think it's best if we just let it go and save the money in buying a new one when we have our own home. haha