Kettles, mash tuns, infants, etc
If it's on stainless steel Bar Keepers Friend will clean off just about anything. I use this on my ss pots and pans and it works great (I try not to use it on mirror finished surfaces though).
You can find it at Bed Bath & Beyond, Walmart, the grocery store, just about anywhere.
EDIT: I also believe that Bar Keepers Friend is a glass cooktop cleaner, so it can def cut through some scorched on food/sauce/liquid.