Sorry that I have been MIA…just busy.
I read the instructions at the site that Repa linked to. It sounded like it would be easy to do, but after loosening the screws on the bottom panel, it wouldn’t come off. We cleaned out the desktop computer, and then went to the Dell site. It sounds like the laptop needs to be totally dismantled to clean it. We sprayed the vents, like it said to, but I think the dismantling will be left to a service shop. Thanks for the link, Repa!