I just watched a report on CHCH Hamilton. A young woman was eating at friends this weekend and felt a stabbing pain in her mouth. The pain continued every time she moved her tongue. Long story short she had to have a 1" long piece of BBQ brush wire removed from her tongue surgically in the hospital. They also reported on an incident where a wire from one of these brushes perforated a mans intestines that required major surgery and could have been fatal. They also said if this young woman had have left this as is she most likely would have had to have a portion of her tongue removed. Scary stuff.
Not only these things are obviously hazardous they are bad for your BBQ grates as they will take the non stick material off and only makes cleaning tougher. Porcelain I think. I tried the soft material that comes on some brushes but it basically melted the first time I used it. I guess that type is used when the grates are cold. The thing didn't come with the instructions I wouldn't read anyway. An onion cut in half works. I will use a soft cloth held by tongues wet with veggie oil to clean the grates and it prevents sticking too.
Throw that steel bristle brush out , now.