My Trilobite didn't work as well as when I got it, took strange routes and the bumper got stuck pretty much all the time.
So I took it apart and cleaned it.
Here's how to do it:
(Unfortunately I didn't take any pictures but I'll try to describe the process for you.)After you take out the batteries, disassemble everything you can find except the LCD.
Also unplug the charging cable in the back (under the foam part).
When you're done with that you'll have to open the bumper.
To do that, take a small screwdriver and push down in the 2 little holes in the bottom.
Don't wiggle or do anything else, just gently push and pull the bumper forward after it unlocks.
Flip the bumper up and first unplug the black/red cables on the left and the green flat cable on the right.
Also unplug the white flat cable from the LCD and buttons. Remove the LCD.
Flip the bumper down and remove the 2 screws on the bottom, unplug the vacuum motor.
After that you can remove the red cover. It's best to grab the vacuum motor and just lift it up with the top cover.
Unplug the wheels and set them aside. Also unplug the power cable and the cable to the roller motor and remove the electronics board.
After that, have fun cleaning

The worst dust buildup will be around the bumper mechanism and the wheels.
It would probably work to just put the all-plastic parts in the dishwasher but I don't own one...
Don't forget to remove the gear belt cover (smaller Torx) of the roller motor and clean the gear wheel in there.
Reassembly is a little tricky but basically just works the other way around.
Pay attention to the wheel guides and remember to lower the vacuum motor with the top.
Don't forget to plug in all cables and make sure the bumper is easy moving again.
After you're done, carefully clean the little holes of the ultrasonic sensors with compressed air.
Your Trilobite should be as good as new!
