White clothes are hard to keep white. They act as magnets for spaghetti sauce or naturally yellow over time. If you have a cotton, nylon and spandex-blend blouse that is looking a bit dingy, avoid chlorine bleach if you can. It can cause the fabric to become discolored or even deteriorate the fibers. Use other common household products to whiten the blouse.
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Put the blouse inside the washing machine. Set the washing machine to the "cold" water temperature.
Add the recommended amount of laundry detergent and 1 cup of hydrogen peroxide. In a front-loading washer, put the peroxide in the bleach dispenser. Run the blouse through a complete wash cycle.
Remove the blouse from the washer. If it is still not white, wash it again but instead of hydrogen peroxide, add ½ cup of white vinegar to the washer. Run the blouse through a complete wash cycle, then hang to dry or tumble dry on low.