Don't! Dawn will suds so much you will be rinsing FOREVER! try using a laundry detergent instead with your peroxide!
Peroxide is a good antibacterial, especially for kids toys. Dawn and white vinegar is used 50/50 for cleaning soap scum. I don't know of a combination of the two.
Hi Kaye: Mix one part blue dish soap with two parts hydrogen peroxide. Apply to the stain, let sit for 10 minutes (or longer), and rinse. (Always perform a spot check first to a discreet area of fabric.) Good luck
In a 16 oz. spray bottle, pour in 14 oz. of hydrogen peroxide. Add a good squirt of Dawn (1 tblsp.) and gently shake the bottle end to end to mix. Spray on the tub, sinks, shower and inside and around the toilet. Let the liquid sit for at least ten minutes. You will have to rinse because of the Dawn. I use a soft sponge and wipe up with a soft old white towel. Shake the bottle each day you use it. If this doesn’t answer your question, please ask it again. Happy cleaning!