I have a bathroom with no window and every time I shower everything gets all steamy. Black mold has already started showing up in the corners and I don't know what product to use without damaging the paint. Is there anything homemade that works well?
The first thing you need to do is control the humidity, because without that no product is going to actually solve the problem. A bathroom without a window is tricky, but after each shower open the door and let air circulate, or use a dehumidifier if you've got the budget. If not, at least light a candle or some incense for a while after you shower - they absorb quite a bit of moisture.
To clean what's already there, mix equal parts white vinegar and water in a spray bottle. It works really well and won't damage the paint if the surface isn't too delicate. Spray it on, let it sit for 15-20 minutes and scrub gently with a soft-bristled brush. If the mold is really stubborn, make a paste with baking soda and a little water, scrub it directly and then clean with the vinegar. I've tried this a bunch of times and it gets rid of the mold without damaging the paint.
After cleaning thoroughly, let it dry completely before closing the door. Once a week use the vinegar as prevention, so it doesn't come back. Also check if there are any leaks or insulation problems in those corners - sometimes mold shows up right where there's cold air drafts or moisture trapped in the walls.
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