Anand,
The decorative ceiling panel hinges downward. You have to remove the screws that secure the panel on the drivers side hidden just inside between the ceiling and panel. You will need a short step ladder to see them. Next you need to lift slightly to disengage the "J" brackets to allow the panel to swing downward. You will need another person to help you because this is really awkward and heavy. Once it is hanging there, You can remove the filters and clean them. Hope this helps, Fred