To prevent water and mold buildup on a toilet seat cover, there are several steps you can take:

1. **Keep it Dry**: After each use, make sure to thoroughly dry the toilet seat cover with a towel or cloth. Moisture creates an ideal environment for mold to grow, so keeping the cover dry will help prevent mold buildup.

2. **Regular Cleaning**: Clean the toilet seat cover regularly with a mild detergent or disinfectant to remove any existing mold or bacteria. Pay close attention to the areas where water tends to accumulate, such as around the hinges and underside of the cover.

3. **Ventilation**: Ensure that the bathroom is properly ventilated to allow moisture to escape. Use exhaust fans or open windows during and after showers to help reduce humidity levels in the bathroom.

4. **Replace Sealant**: If the toilet seat cover is attached with a sealant or caulk, periodically inspect it for signs of wear or damage. Replace any deteriorating sealant to maintain a tight seal and prevent water from seeping underneath the cover.

5. **Use a Water-Resistant Cover**: Consider using a toilet seat cover made of water-resistant materials, such as plastic or vinyl. These materials are less likely to absorb moisture and are easier to clean than fabric covers.

6. **Dry Underneath**: Occasionally lift the toilet seat cover and dry the surface underneath to prevent moisture buildup and mold growth in hidden areas.

By following these steps, you can help prevent water and mold buildup on your toilet seat cover, ensuring a cleaner and more hygienic bathroom environment.