Since I have an oily scalp, I do not use conditioner or treatments at all; I use only shampoo. Those with oily scalps will understand. For oily scalps, the key is keeping your hair from getting greasy in the summer. Shampoo is my go-to hair care item for the rainy season. Kerasis shampoo costs only 4,500 won for a 1-liter bottle. It is my cost-effective hair care product.