Found this over at AVS for you guys who are approching your 1st cleaning, below are some great directions to follow. This guy did a great job on explaining this, and it's great for newbies. * InFocus recommends cleaning the lamp housing filter screens every 200 to 250 hours. * "While this may sound like a daunting task, it is actually quite simple. Here's the InFocus instructions (mildly edited, with photos added) on how to perform this routine maintenance task: Cleaning the Lamp Housing Filter Screens In dirty or dusty environments, the two dust filter screens in the lamp housing can become clogged, causing high temperatures and premature lamp failure. Routine maintenance to remove dust from the filters lowers the lamp operating temperature and prolongs lamp life. - Turn off the projector and unplug the power cord. - Wait 30 minutes to allow the projector to cool thoroughly. - Turn the projector on its side so that the lamp door is facing you. Using a small flat-blade screwdriver, gently pry the lamp door from the projector by placing the screwdriver blade into the two slots between the top of the lamp door and the projector - Loosen the two captive screws that attach the lamp housing to the projector. - Detach the lamp power connector from the projector by depressing the locking tab on the connector and lightly pulling it free. WARNING: To avoid burns when handling the lamp housing, be sure you have allowed the projector to cool for at least 30 minutes. Do not drop the lamp housing or touch the glass bulb! The glass may shatter and cause injury. - Carefully remove the lamp housing. - Examine the dust filter screens on either side of the lamp housing. If they are dirty, use a vacuum cleaner set on low power to clean the two screens. Be careful not to disturb any internal components when cleaning the screens. - Replace the lamp housing and tighten the screws. - Re-attach the lamp connector to the projector. The locking tab should engage when the connector is fully plugged in. - Replace the lamp door. - Plug in the power cord and toggle the Power switch to turn the projector back on. It's that easy! So do not neglect this routine maintenance, or you risk seriously shortening your lamp life." ----------------------------------------------------------- To cheat a little on cleaning after the 4805 has cooled down, i shut it off manually. The fan runs 24/7 to keep the power supply cool, although you can not really hear it. By doing a hard shut down this keeps the pj from sucking in dust when not in use. I notice a big difference between (dust build up) cleanings vs pj off and on standby mode. Hope this helps and yes it really is that easy!