You could use these hair-masks to treat dandruff;
• Yogurt, honey and lemon juice hair mask.
• Heat coconut oil and add lemon juice in it and massage all over scalp.
• Soak Methi seeds in water overnight and grind the next morning. Apply on scalp and wash after an hour.
• Grind Neem leaves and apply on scalp for great results.
• Henna pack works wonders, use all over scalp and hair and wash after a few hours.
• You could use Multani mitti on scalp and just wash off with water. You would not need even shampoo coz the mud would remove all impurities from your scalp.