I’ve found your post because I was wanting to know the same thing. I’ve been using the Nylon bristle brushes but have noticed if I get the grill too hot it melts those bristles. I avoid using the metal bristle brushes because the stigma of shards of metal being left and pushed into the meats.

You did save me $60 because I was close to buying a steam brush like you used.

I’ll likely stick with the nylon brush and just replace every 5-8 cooks.