Biological detergent has enzymes in the powder that help clean stains that non-biological detergent does not contain. [1] X Research source
Test the bleach on a small area of the sheet before you soak it all to make sure the material won’t be damaged by the bleach. Take caution when handling bleach as it can be dangerous to humans and animals. Use it in a well ventilated area and do not breathe it in. Also, make as minimal contact as possible between your skin and the bleach.