I used it on a Weber gas grill that hadn't been cleaned for months, resulting in it being full of grease from grilling.

I didn't spray the external inox surfaces, but I applied it to everything else, e.g. cast iron, tray, burner covers, etc.
I didn't leave the product on for more than 5 minutes to act, in case it caused problems on any surface, although nothing strange appeared.

Considering the low ambient temperature and the cold water, I can say that it helped a lot with the cleaning. Of course, I used a wire brush and steel wool. Probably for someone more diligent than me who cleans more often, it would have even better results.

It does a pretty good job on the cast iron parts, but be very careful because it is very caustic and if it gets on the stainless steel part it creates dull spots.