Operation Zero Chametz
Passover is a holiday that mandates our complete involvement, not just during its eight days but for weeks befor
We accomplish this by cleaning and inspecting our homes well before Passover, and gradually eliminating chametz from every room and crevice. This intensive cleaning takes place in Jewish homes throughout the world. The following wizard and articles will help you tackle the process in your own home.
Take From : http://www.chabad.org/holidays/passover/pesach_cdo/aid/1753/jewish/Operation-Zero-Chametz.htm