I live in Central Georgia,(read very hot and humid) and I have not had
a problem out of my cast iron grates as of yet(knock on wood). I have 4
separate grates on the grill and I usually rotate them out when
cooking. Also, after every cook, while they are still warm, I wipe them
down with an oil cloth.

This is the same treatment I give my cast iron skillets when I cook
with them. So far, I have only had problems out of one Dutch Oven, and
that's because it did not season right in the first place. OTOH, i've
had my other Dutch Oven for about 20 years, and it has only had to be
reseasoned once .

now can anyone guess which Dutch Oven was made in the USA and which one
wasn't?