I would be interested to know what @BambuLab thinks of cleaning filament and whether you are considering offering it in the future.
I occasionally use cleaning filament for rinsing. But doing it manually is annoying. First, the extruder is heated to +10°C, the last printing temperature used for the filament. Then cleaning filament is extruded, which can absorb residues better than other filaments and is therefore better suited for cleaning the inside of the nozzle, until the filament is extruded without residues, which is usually the case after a few centimetres / millimetres. The new filament is then fed in and printing continues.
An AMS slot could be filled with cleaning filament to be used automatically when changing filament.
Kind regards!