1. Wash the affected area with soap and water. This will help to remove any residual drain cleaner and dirt.
2. Apply a paste of baking soda and water to the stain. The baking soda will help to neutralize the acid in the drain cleaner and remove the stain.
3. Let the paste sit for 15-20 minutes. This will give the baking soda time to work.
4. Rinse the paste off with water and dry the area.
5. If the stain is still visible, repeat steps 2-4.
6. You can also try using a commercial stain remover. Be sure to test the stain remover on a small area of the plastic before applying it to the entire stain.
Here are some additional tips for removing drain cleaner stains from plastic:
* Do not rub the stain. This can cause the stain to spread and become more difficult to remove.
* Do not use harsh chemicals or abrasive cleaners. These can damage the plastic.
* If the stain is on a painted surface, be sure to use a stain remover that is safe for paint.
If you are unable to remove the stain yourself, you may need to take your car to a professional detailer.