Since it is prohibited to possess chametz on Pesach, any chametz left undisposed must be sold to a non-Jew. [Any chametz remaining in the possession of a Jew during Pesach may not be used, eaten, bought or sold even after Pesach.]
Therefore, all chametz that will not be eaten or burned before Pesach and all chametz utensils that will not be thoroughly cleaned by then should be stored away.
The storage area should be locked or taped shut to be leased to the non-Jew at the time of the chametz sale.
Since there are many legal intricacies in this sale, only a competent rabbi should be entrusted with its execution. The rabbi acts as our agent both to sell the chametz to the non-Jew on the morning before Pesach starts and also to buy it back the evening after Pesach ends.
To learn more about about the search and removal of chametz, click here.
For a downloadable PDF version of the Sale of Chametz Contract, please click here. The form can be mailed to the Chabad Jewish Center at 1803 S. Maple Grove Rd., Boise, ID 83709 or faxed to 208-853-9201 or scanned and emailed as an attachment.