I have a nylon and brass brush set hanging by a small bungee on my bag, and in 2020, took off the brass brush, after purchasing Cleveland CBX2's. I don't want to ruin the micro-grooves with the brass brush. Keep the end of my towel wet during a round, and use the nylon brush as needed. I play "hybrid irons", and the grooves are not as deep as conventional irons, so the damp towel works well, and the same for my fairway wood. Clubs get a bath a few times a season, with a soft nylon scrub brush, and grips too...