Deep Conditioning on Dry or Dirty Hair
'Deep conditioning on dry dirty/old hair is quite confusing to me. In between wash days, if you are adding product daily for styling or just to moisturise, how can the deep conditioner fully penetrate your hair? Maybe it depends on the whether or not the products used during the week are light or heavy? There are some ladies that do this while using heavy products like butters and conditioners with non-soluble cones, mineral oils, gels and things of the sort. I feel like it would be such a waste of deep conditioner when used on dirty hair. It seems to make more sense to deep condition on clean slightly damp/dried hair in my opinion but I guess there is more to it so I could be wrong.'
A: I agree that conditioning on dry /dirty hair is odd but for slightly different reasons. Conditioners work mainly on the outside of hair - smoothing the cuticle, softening hair and temporarily mending cracks or flaws. In order to do this work, the ideal condition is that surface of hair is clean i.e oil and dirt attached to the oil is removed first with shampoo. I guess that some people are just looking for a small midweek softening boost so do not see any harm in not cleaning hair first. As long as shampoo features at the next wash, build up should be kept to a minimum.