Welcome to Just Answer and thanks for your question. Reek Out has pretty much cornered the hockey and football market. However there are other products out there that work by the same mechanism. The best place to start is your larger pet products store. There are lots of brand names but look for the ones that eliminate the odor rather than masking it. Some of them even eliminate skunk odor. They aren't as cheap as sprinkling everything with baking soda but they are more effective and a lot cheaper than Reek Out if you are going to use the stuff by the quart as most hockey moms do.
They don't publish ingredients. The mechanism is that the odor remover combines with the odor-causing molecule, locking it up.