We may have Neutrogena’s Anti-Residue Shampoo to thank for what industry insiders are now calling “circuit training” for your face. Almost 30 years ago, the company introduced the rotation concept, claiming benefits can get lost with consistent use of the same products. Formulated for once-weekly use to clear away residue that could be blamed for a bad hair day, the product promises to remove up to 90 percent of dulling build-up caused by the use of the same shampoos, conditioners and styling products day in and day out. The 6-oz. bottle, which retails for $5.49, created a new trend—one that’s moved from follicle to face.