Grillbot.
I use the same brush on expanded metal grates I use a 6" tape/putty knife.I use the Alpha Grillers 18" Grill Brush, been very happy with it have yet to find metal on, under my grates or in my cook chamber.
https://www.amazon.com/gp/product/B00T95H1PE/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Anyone use the wood grill scrapers? Thoughts?