First of all, I no longer have a gas grill â€¦ but the grates I have on my wood pit appear the same. I have been cooking bbq with them a long time â€¦ and it became really hard to remove meat residue with just my normal overnight soak in Dawn. (I pre coat with Pam for grilling) Closer inspection with a bright light showed crusty carbon had completely covered the smooth coating. I found oven cleaner to constantly remove the black crud â€¦ but I'm $20 deep buying that and new grills are $80 Brushes don't do anything and I don't want power tools to damage the coating I don't have the ability to apply super heat â€¦ this stuff is baked on pretty hard. The el cheapo cleaner was doing Ok, then I buy one made for gas grills (costly) â€¦ but like something on a boar hog. At 75% clean would you stay the course or know a real good spray ?