Sulfates are contained in cleaning agents (detergents) and you’ll find them in most industrial and home cleaning products, such as:
Car Wash Soaps
Bubble Bath Products
They are also used as a standard in Medical Trials / Testing by Dermatologists to purposely irritate the skin in order to measure healing.
This ingredient, which is standard for most shampoo (and household cleaning) products, has additionally come under attack for causing frizziness (especially in curly hair) and damaging coloured hair. After receiving any chemical treatment, it is best to always use sulfate-free shampoo and conditioner to maintain the style and keep your hair looking healthy.