I don't believe that Dylon Run Away is available in the US now, but a nearly identical product, Rit Color Remover, is easy to find throughout the US. Look at the grocery store or pharmacy; if you can't find it there, a sewing store such as Joann's should have it.
Dylon Run Away is based on sodium hydrosulfite plus sodium carbonate (washing soda). Other brands with similar formulations include Rit Color Remover, Tintex Color Remover, Dylon Run away for Whites, and Carbona Color Run Remover.
Each of these is safer for clothing than chlorine bleach, which contains sodium hypochlorite. Hypochlorite will permanently damage synthetic fibers such as nylon, spandex, and polyester, as well as natural animal-based fibers including wool and silk. The only fibers for which I recommend chlorine bleach are 100% plant-based fibers, such as 100% cotton, linen, or hemp.
There is one exception to my preference for these color remover products over chlorine bleach. The indigo dye that is used to dye denim for blue jeans does not fade when you use Dylon Run Away, Rit Color Remover, or any of the other similar color removers. The only dye remover that works on blue denim is chlorine bleach.