<p>Yaher koach for distinguishing between peasch preparation and spring cleaning and reminding you congregants that isolated crumbs are not chametz. &nbsp;However, the shiur of 30 g for a kezayit is machmir when it comes to eating matzah, but it seems quite meikil when it comes to cleaning. &nbsp;An Oreo cookie, for example is 15g, and we would not call that a crumb too small to eat, I think. &nbsp;For cleaning wouldn't it be proper to use an olive sized k'zayit?</p>