Start by looking for visible signs like black or green patches near sinks, windows, or basements. A musty smell is a strong clue, too. You can buy a home test kit from a hardware store—just follow the instructions to take air or surface samples. Send them to a lab if you want details on the mold type. For a quick check, dab a hidden spot with a bleach solution; if it lightens quickly, it's likely mold. Always wear gloves and a mask, and keep the area well-ventilated while testing. how to test for mold in a house 54