If your hair is normal to oily, you can use more apple cider vinegar than someone with dry hair to remove buildup, as the vinegar is less likely to strip away essential oils from normal hair. Mix 1/4 cup vinegar with 3/4 cup warm water for short/medium hair and double the recipe for long hair. Let the mixture sit within arm's reach while you jump into the shower and wash your hair.
Shampoo your hair, rinse, condition and rinse, just like always. Slowly pour the vinegar mixture over your hair, making sure every inch of every strand is covered. Let the mixture sit and drip from your hair for 30 to 60 seconds.
Rinse your hair thoroughly with cool water. If you still smell vinegar, mix a dab of perfume and water in your palms. Lightly stroke your hair with your palms and rinse well again. Squeeze the excess water from your strands, wrap them in a towel and proceed with your normal styling routine.
Dry and damaged strands need only a light touch of vinegar to help remove buildup. Too much vinegar can strip away the already sparse oils. Add 1 tbsp. of apple cider vinegar in a small plastic cup and place it in the shower. (Plastic, not glass, or you could have a nasty accident.) Double the amount for medium-length hair and triple it for long hair.
Jump into the shower and wet your hair with warm water. Mix your normal shampoo with the vinegar in the cup. Use the mixture to shampoo your hair well. Rinse your hair extremely well with warm water.
Condition your hair as usual and rinse well with cool water. Squeeze out the excess water, wrap your hair in a towel and follow normal styling habits.
If you have blond hair, add a little fresh-squeezed lemon juice to the apple cider mixture. The hint of lemon not only helps get rid of oils, it enhances golden highlights. The effects will be subtle, because the lemon is rinsed from your hair.