I have a new Harman accentra, and since I wasn't here when it was installed, I have no idea what it even looks like inside, once I slide it out. So I was thinking about getting it cleaned by the installer this year and being home to watch. Is there anything I need to tell them? Do they clean the Chimney insert that they slid all they way up my chimney? Should I clean everything in the front that I usually do weekly before they come?