No, you don't have to brush every day. It's good to check regularly, especially at the beginning. Let more or less grow based on what kind of rind you want, you'd get away with every two days or so. But it's way easier than wiping. Just pull out, brushy brushy, stick back in, ignore until tomorrow. After 2-3 weeks mold will slow down as the rind gets established, and you don't have to take as much care.