I don't think anyone answered this. When I purchased supermarket detergent, I used Cheer - free (no scents).So, what is the best prescribed detergent? Serious question.
I make my own now for really dirty things & for normal washing I just use soap nuts and Mg. pellets. I will show links. I haven't purchased laundry products in ages. I really like being able to get many loads from these things and not having to continue to purchase them. I also use vinegar in the fabric softener dispenser. There is no residual smell. When our drier dies which I am not wishing for in any way, I will probably not replace it as I usually hang our clothes.
Soap Nuts:
https://www.amazon.com/Soap-Nuts-Be...UCwTuumFAryCMfuEj71cIFrm61ZZpiohoC-L4QAvD_BwE
Mg Pellets:
https://www.amazon.com/200-300-natu...agnesium+laundry+pouch,hpc,164&sr=1-1-catcorr