Many people thing mouth rinse and mouthwash are the same, but that would be wrong.   

Mouthwash: Mouthwash is used to help freshen your breath.

Mouth Rinse: An antiseptic mouth rinse, however, will actually help to reduce the bacterial load found in plaque.  By using mouth rinse it will help prevents plaque build-up more than just brushing and flossing alone.