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I had the same problem with the faucet in my apartment - hard water, and after six months the whole tap was covered in chalky streaks. At first I tried the same things people suggested above, but the results didn't last. Then I found salvation in a limescale remover like Cillit Bang or something similar - you spray it on, wait 15-20 minutes and wipe it clean with a cloth. It doesn't leave scratches on chrome if you don't scrub it with a metal brush. After that I dry it with a microfiber cloth, and the chrome stays shiny and new-looking much longer than it does after vinegar.
Try vinegar - soak some cotton wool or a soft cloth in it and rub the stains, then rinse with water! If that doesn't work, make a paste from baking soda and a small amount of water, apply it to the dirty spots and gently rub with a non-abrasive sponge. The main thing is don't scrub with a stiff-bristled brush, or you'll scratch the chrome! After any cleaning, wipe the parts dry so no new streaks or spots are left behind.
The spots on chrome are usually limescale or rust, not dirt, so a regular cloth won't cut it. Try white vinegar: spray it on the spot, wait about five minutes and scrub with a soft brush or sponge, then rinse well with water and dry thoroughly - that'll prevent new streaks from forming.
White vinegar and baking soda work, but they mostly handle surface streaks 😊 If the spots have already set in or it's actual rust (brown dots), a special chrome cleaner or a multipurpose cleaner like Cillit Bang helps - those products penetrate the micro-cracks in the coating better. The key thing is to dry everything thoroughly right after cleaning, otherwise the spots will come back in a day or two, especially if your tap water is hard.
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