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White vinegar is your friend for this - spray it on, let it sit for a few hours, and scrub. If it's really gunked up, diluted bleach works better, but make sure you ventilate well and wear gloves because it's harsh stuff. There are also specialized anti-mold sprays at the store that do the job without much effort, but honestly vinegar is cheaper and works just as well for most cases.
The problem with store-bought products is they're expensive for next to nothing. With me, mold keeps coming back in the grout, so I ended up buying a cheap electric toothbrush and some baking soda mixed with a bit of water - you make a paste, you scrub the grout with the brush, and it really does the job without wrecking your hands. For the black stains on the tiles, a squeegee after your shower - it's simple but it makes all the difference, because humidity is what feeds the stuff.
To keep it from coming back so quickly, what really makes a difference is getting rid of the moisture - good ventilation after you shower or a small dehumidifier if your bathroom is really damp. Otherwise even if you clean it well, the mold grows back within two weeks. And especially for the grout, you really have to dry it thoroughly with a cloth after every shower - it's a hassle but it triples how long it takes before you have to clean again.
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