Simple Green BBQ Grill Cleaner Product Review. We have a Weber gas grill with a cookbox that has 15 years of carbon, grease and grime build up and we are trying out Simple Green's heavy duty bbq grill cleaner to see if this product can help us clean this cookbox to prep the grill for another season of grilling. We had great success in using this to clean the peeling inside cover of our Weber gas grill since this peeling is the cause of a build up of carbon. This cleaner helped break the carbon, grease and grime down to make it possible to scrub and power wash away.

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