I've never added it to homemade powder, but I have mixed it in with commercial clothes detergent powder, so I think you should be able to do it with homemade.
It was pretty easy for me to do it with the commercial product because the soap and OxyClean containers are labelled for how many loads are in each (using the recommended amount per wash). I mixed the OxyClean and commercial soap powder based on that; used a wooden spoon to mix it in a squeaky clean bucket then put it in a dollar store tote to dispense.
Add your voice to the conversation. Click here to answer this question.