Remove basement mildew by first fixing any moisture issues. Clean the mildew with a mixture of water and vinegar or a mildew cleaner, scrubbing affected areas thoroughly. Ensure proper ventilation and consider using a dehumidifier to maintain low humidity levels.

Fix moisture issues, clean mildew with a water and vinegar solution or mildew cleaner, and scrub affected areas thoroughly. Proper ventilation and using a dehumidifier help maintain low humidity levels and prevent mildew recurrence. Effective cleaning and moisture control manage mildew problems.