Matt, I can't comment on the "commercial" grade part of your question, but I have had good luck with the elcheapo type from Walmart. I use the black platic handle job with brass bristles. It has a metal plate on the end with 2 sizes of grate cleaning grooves. Handle wont rot, bristles wont rust, and it cleans up easily with hose pipe pressure nozzle. Just my 2 cents worth!
