I need help. I have a problem thickening and getting slip from anti dandruff shampoo. These are the ingredients used: SLES-15%. Alkyl sofane-10%. Cocamedopropyl Betaine-5%. Cocamide DEA-2%. Salicylic Acid-2%. Guar-0.5%. Menthol-0.5%. Fragrance. Proplyne Glycol-0.5%. I have used salt but I didn't get the viscosity increased as expected. I also used Sodium Hydroxide to balance the pH. Please can anyone help me on how to improve the viscosity and get it slippery. Thank you.