A friend needs to replace the scrubbers she uses to clean her sugarhouse evaporator. They're squares of stainless mesh about the size of those flat green scrubber things, but MUCH more heavy-duty. Someone told her they have them at grill rental places, but the one she tried was no use. Any idea what these things are called and where to find them? Or what else might work? Note that grease is not an issue here--just getting through fired-on crud.