Finish the following sentence with the best choice: How to clean a dirty bank card strip so it works effectively?

Choices:
- First rub the strip with a cotton cloth and then use a pencil to gently rub away dirt on the strip
- First rub the strip with a cotton cloth and then use an eraser to gently rub away dirt on the strip

Answer:
First rub the strip with a cotton cloth and then use an eraser to gently rub away dirt on the strip