The bleach may have burned the leaves. How much damage was done is hard to say. I would water heavily to flush the chemical out of the soil. Lack of water could also be an issue. Roses are party girls, they like to drink. In Michigan 5 gallons per plant a week is the rule of thumb. If you have a neighbor who grows great roses, ask how much they water. I'd water twice a week. Best And Happy Yardening, Nancy.