My clear braces are bright yellow

Ask the ortho what is safe for them. Most of the time when they are stained you can not make them clear again... DO NOT USE WHITENING MOUTHWASH!! It will whiten your teeth but not under the brackets so you will have marks from the brackets on your teeth when you get your braces off and they are really hard to get rid of. Most of the time you have to get your teeth professionally bleached to do so.