http://revach.net/article.php?id=3644

Section: Halacha   Category: Tshuvos
Gebrucks On The Last Day Of Pesach? What About The Dishes?
Many people who do not to eat Gebruks, have a minhag to eat Gebruks (Shruya) on the last day of Pesach outside of Eretz Yisroel.  The Minhag Yisroel Torah brings from the Bnei Yisaschar in Derech Pikudecha that any chumra we keep on Pesach that is clearly beyond what is required by halacha should not be upheld on the last day of Pesach to show that it is not really Chametz.  Similar sentiments are echoed by the Rema who writes (OC 447:5) that certain chumros are not kept on the last day of Pesach. The Pri Chadash and Maharam Ash both disagree and hold that treating the last day more leniently is a Zilzul to Yom Tov Sheini.

The question is how can one use these dishes for the first days of next Pesach if we don't eat gebruks on those days?  The Minhag Yisroel Torah brings from the Darkei Chaim V'Shalom that some are noheg to keep an extra set of dishes for the last day of Pesach.  However he says many are not Makpid since the Chacham Tzvi says that after 12 months of non-usage, keilim you do not need to kasher keilim.  This however only helps in a Shana Mi'uberes which has 13 months, but in an ordinary year you fall short of the 12 months by 7 days.  The Mahari'a HaLevi says that the 12 months need not be exactly 12 months and even if you fall short by a few days the heter of the Chacham Tzvi still applies.
 
Important Note: We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. One should learn the tshuva to verify the accuracy of our interpretation.  Please also understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.