After letting the solution sit, use a soft brush or a sponge to scrub the stained areas vigorously. A toothbrush can be used for tighter spots where harder brushes cannot reach.
Rinse Thoroughly:
Once the stains have been scrubbed away, rinse the area with clean water. Ensure all the cleaning solution and loosened debris are washed off completely.
Dry the Seat:
Wipe the toilet seat with a dry cloth to remove any remaining moisture. This step prevents new bacteria from thriving on the damp surface.
Regular Maintenance:
To prevent future yellow stains, clean the toilet seat regularly using the vinegar and water solution. Applying this routine weekly can greatly reduce the occurrence of new stains and maintain the cleanliness of your toilet.
By following these simple steps, you can effectively eliminate those stubborn yellow stains on the underside of your toilet seat. Regular maintenance is key to keeping your toilet fresh and inviting for both family members and guests.

Tips for Preventing Future Stains:
Always ensure good bathroom ventilation to reduce humidity levels, which can contribute to the growth of bacteria. Additionally, encourage household members to clean up any spills or splashes immediately, as this will help in preventing stain formation and maintaining overall hygiene in the toilet area.