| Persistent brown or orange rings | The cause can vary; use a cleaner designed for the specific deposit. |
| Mold or suspected biological contamination | Use an appropriate cleaner and follow its label. A dryer sheet is not a disinfectant. |
| Scratches or damaged porcelain | A dryer sheet will not repair the surface. |
If a stain repeatedly returns, it may help to investigate the underlying cause rather than repeatedly rubbing the same area.
Hard-water deposits, for example, often require a product designed to dissolve mineral buildup. Follow the product label and confirm that it
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