To prevent mold in the bathroom, ensure proper ventilation by using an exhaust fan and keeping windows open when possible. Regularly clean surfaces with mold-killing cleaners. Fix any leaks promptly to avoid moisture buildup. Use mold-resistant paints and materials for walls and ceilings. Ensure the bathroom remains dry by promptly addressing spills and excess moisture.

Use ventilation, clean regularly, fix leaks, and use mold-resistant materials.