Hair Cleaned Too Deeply

A: It's most likely that this "stringy, tangled" feeling was a result of the hair being cleaned so deeply.
The key to cleansing the hair properly is to simply shampoo the hair only when it seems dirty. It isn't necessary to wash the hair every day, and when you miss a day between shampoos, you don't necessarily need to double up on the shampooing process afterward. When clean, the hair should feel clean but not quite "squeaky".
You can actually accomplish sufficient cleansing from daily use of a rinse-through conditioner, since conditioners are generally still sufficiently alkaline to remove oils and dirt from the hair.
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See also:
How to shampoo your hair
How to limit the detangling work after shampooing your hair
How to get rid of tangled hair
Fragile wet hair