Thanks Iascisrmma I saw that teshuva, though In context he is talking about giving a hechsher on splenda. which (As I understood) even if technically muttar, we wouldnt rely on it lechatchila to go ahead and give a hechsher for Ashkenazim for PEsach along the lines of R’ Moshe’s long established policy for hashgachos not to rely on eino ben yomo “mechuar hadavar” even though TECHNICALLY we can eat kosher food produced from a goy’s treif machinery, since HE has no gezeira of eino ben yomo utu ben yomo.
that said, the CRC’s publication Sippurim in 2012 wrote the following by R’ dovid choen “Rav Belsky ruled that since the minhag of kitnios has become so well established and accepted for all Ashkenazim, if a utensil was used with kitnios one is required to kasher that utensil before using it for Pesach food. ”
The question I have though, is I once heard from R’ Belsky that when something is muttar bedieved we dont apply gezeira of aino ben yomo utu ben yomo. Example there is no question that a pareve item (eg spageti) cooked in a fleishig pot ie a nat bar nat., if then mixed with cheese is mutar bedieived. Thereofre R’ Belsky held (and the truth is this is a GR”A YD 95:10) if the fleishig pot was used >24 hours ago you can lechatchila use it for spaghti planning to then eat the pasta with cheese.
There is no question if a kitniyos pot was used on Pesach the food is muttar, ( if there is more food than pot since kitniyos is batul brov) Therefore according to the above it should be muttar to use a kitniyos eino ben yomo pot on PEsach.
Again though clearly he didnt hold that regarding kitniyos
חבל על דאבדין ולא משתכחין