Besides just general house cleaning, like wiping down counters and so forth, vinegar is great for shower heads and sink sprayers. You just disconnect the shower head or sprayer head and soak it in undiluted vinegar. (If you have a massaging shower head, you might not even have to disconnect it - mine will reach into a bucket of vinegar).
It will actually be done before it quite looks done; after a couple of hours, lift it out and scrub around the water openings with an old toothbrush and that pink grub should come right off.
It's particularly nice for shower heads because a sort of nasty germy "biofilm" builds up in your shower head. This wil make it not only look better, but will disinfect it.