Chronic dandruff often requires long-term maintenance rather than a temporary cure. Since your current regimen isn't keeping it away, you can try rotating to alternative medicated shampoos containing ketoconazole, selenium sulfide, or coal tar. For thick scaling, a shampoo with salicylic acid helps clear buildup. Use the medicated shampoo 2-3 times a week initially, leaving it on your scalp for 5 minutes before rinsing. Once cleared, use it once weekly for maintenance to prevent recurrence. Avoid using topical steroid lotions long-term without medical supervision. If it persists, please consult a dermatologist for a personalized plan.