The crumb tray can just be left as is unless the buildup starts interfering with the placement of a material.
Check out the support link in the app and click through to cleaning and maintenance. It does address some of this.
I may kick this to beyond the manual but:
What the pre-release folks found was that using some mild cleaner on the inside of the machine to keep the buildup in check is not problem.
First go over everything carefully with a vacuum cleaner attachment.
There have been those who have even dissassembled the honeycomb , soaked it and cleaned it back in the days when the honeycomb was silver colored.
I’ll carefully wipe down the rails and other surfaces without any cleaner to ensure they are not obstructed.
I use Simple Green and some old rags and then wipe things down with paper towels. Glass cleaner on the lid and the tubes.
You actually can just leave it build up. As long as the lenses and path windows are clean, you are good to go.
The exhaust can get clogged up where the fan blows out the back. Check that.
Lots of topics on cleaning through the years.