Over time, white clothes can start to get a yellow, grey, or blue tint to them. This can be from body oils, detergents, or be due to all kinds of things. To make your clothes bright white (and beautiful) again, follow the instructions below.
Pour some hot water into a plastic, enamel or stainless steel (not aluminum) container. Add some dishwashing soap and a little bit of bleach, and stir that mixture together really well. Add your clothes or towels (or any white items) that are 100% cotton into your container and let them soak for about 30 minutes. When the time is up, wash these items as usual and when you take them out, they will look brand new!
For white items that have yellow stains, just mix hydrogen peroxide, baking soda, and some dawn dish soap. Once you have a paste-like mixture, use a small scrubbing brush, and apply the mixture to the area that needs treatment. Scrub it in well, and let it sit for about 30 minutes. Then throw your white items in with your other whites that need to be cleaned, and follow your normal washing and drying routine. The stains will disappear and your clothes will look really white! This works especially well for armpit stains in clothing.