How can I variety my white clothes whiter?

I use a public laundry mat so I would like some hints that don't included have to soak my clothes. My whites just are starting to look a moment or two dingy and I wear them often to work and necessitate them to look white white. Any hints and tips would be great! I currently use Arm 'n' Hammer liquid detergent and bleach surrounded by the hotest setting. Thanks in finance for the advice!
Answers:    There is a 'Bluing' agent that certainly brightens your white clothes. Look for it in the detergent isle surrounded by the grocery store.
I soaked all my whites surrounded by oxiclean overnight and they all come out bright and the yellowing under the arms come out also!
1/2 cup oxiclean dissolved in heat up to hot water, plenty water to cover the clothes contained by a bucket.