Yes, hydrogen peroxide can be an effective whitening agent for white towels. Hydrogen peroxide is a bleaching agent that breaks down the chemical bonds that cause stains and discoloration. When applied to white towels, hydrogen peroxide can help to remove yellowing, dinginess, and stains, restoring the towels to their original brightness. To use hydrogen peroxide as a whitening agent, mix it with water and soak the towels in the solution for several hours before washing them as usual.  Alternatively, you can add hydrogen peroxide to the wash cycle along with your regular detergent to boost the whitening power of your laundry routine.