Should you pre-poo before co-washing or should pre-pooing be done only prior to shampooing?
It is usually done before shampooing because of the stripping of the hair's natural oils. Pre-pooing helps the hair retain some moisture that could be lost due to the sulfates in shampoos. If you wanted to do it before co-washing that should be ok, just be aware that u will need to rinse with warm water because your hair will be oily from the prepoo.
I would restrict doing a pre-poo before shampooing, as a co-wash conditioner may not be formulated to thoroughly remove excessive oils.
pre-poo before shampoo. Conditioners aren't formulated to remove dirt and oil so if you pre-poo and cowash, there's a chance you could still have the oil in your hair.