A Thought For Erev Pesach
I saw in a sefer that it may be humanly impossible to avoid a mashehu of chametz, but that if a person does everything that the Shulchan Aruch requires, Hashem will see to it that every mashehu of chametz is eliminated. So we must do what the Shulchan Aruch requires and be mispallel for siyatta diShmaya to protect us from anything that is beyond our means to control. That is what you should do, and enjoy Pesach with menuchas hada'as.
(Rabbi Abraham J. Twerski)