How do we know that co-washing is really cleaning the scalp?
you know by the way your scalp looks, feels, & even smells (if it comes to that
). i haven't used shampoo on my hair since i bc'd in 2006. co-washing (& water
) is enough to keep my scalp clean, and my hair healthy, & moisturized. but that's not a blanket statement, like with most things hair -- it will work for some & it may not work for some. it depends on you & your hair ... for example, i don't use a lot of styling products on my hair i.e. gels, pomades, greases, spritzs, holding sprays. so this could be another reason why my hair responds to no-pooing/co-washing.
most conditioners contain mild surfactants & gentle cleansing agents by design, but the only way to know if that particular conditioner will work for your hair is to try it. if your hair is relatively healthy, it doesn't take multiple uses to determine if a product is working on your hair ... does your hair feel softer, drier, or the same? does your scalp look & feel clean? is there any build-up, or residue? does it smell good or bad? ... questions like these can help you determine if any product is working for you. yes, you will witness the cumulative effect from multiple uses of a product ... but you can usually tell from step one how a product is trending, if you really pay attention to your hair, & how it responds to different products/ingredients -- a simple did this make my hair feel worse or better than where i started.
suds don't mean it's cleansing. most manufacturers ad sudsing agents (sodium lauryl sulfates) to shampoos because most consumers equate big, sudsy, foam with big, cleansing, power. the suds have nothing to do with your shampoo's ability to clean -- they can look & feel nice --but it can equate to stripping your hair of natural oils, & over-cleaning the hair & scalp.
shampoo works for some people. for some it doesn't. only you can determine what is or isn't working for you. you just have to learn to trust yourself & what you are experiencing, & let others do the same.