I shampoo twice a week and usually only lather up once, sometimes twice if I feel it's really dirty. I'd be concerned about the ingredients in the hairspray more than the shampooing causing a problem. Though, less is really more when it comes to washing hair. It's a good idea to eliminate sulfates and parabens from your haircare routines. Sulfates are very harsh drying for your hair and may be carcinogenic. There's evidence that absorption of sulfates through our skin can cause a build up of them in or internal organs. EEP! Sulfates are included in our shampoos and other sudsy products because they produce lots of bubbles. They also strip things off of our hair. This is necessary when using products that contain silicones. Though most cosmetic silicones aren't, in themselves, harmful, sulfate free shampoos can't always strip the silicones out of your hair so when using a silicone free shampoo, you have to make sure your conditioner and styling products are silicone free. Silicones make our hair really shiny at first but a build up of silicone that isn't being washed out, ultimately dulls hair and makes it become oily faster and may cause a sticky or brittle texture. This may sound like a big hassel, but really, once I cut the sulfates, parabens, and silicones out of my haircare and reduced washing to twice a week, my hair is a lot less problematic for me! Looks and feels healthier and is a lot more manageable and holds style better. less