The stains remain after peroxide or Magic Eraser
The plastic looks evenly yellowed rather than blotchy
There’s an odor that won’t disappear
Then the seat is permanently stained, not dirty.
And here’s the good news…
Replacement Is Often the Best (and Cheapest) Solution
A brand-new toilet seat:
Costs $15–$30
Takes 5–10 minutes to install
Eliminates hygiene doubts completely
For something you use daily, replacement is often more satisfying than endless scrubbing.
Bottom Line
Yes, there are cleaning tricks worth trying—especially peroxide, vinegar, and gentle abrasion. But if the stains are baked into the plastic, no miracle cleaner will truly restore it. In that case, replacing the seat isn’t giving up—it’s upgrading your peace of mind.
Sometimes the cleanest solution is a new start. 
