Since when did the engineers or anyone else for that matter clean the floor around their desk at work, or the tables in the cafeteria's.
I too clean up after myself, but im not responsible or able to hover the carpets, remove the twenty dead blow flies from the bottom of the windscreen, wash the lambskin seat covers with 5 years of accumulated fart fumes in them, or remove the black skin oil marks from around the various switches on the overhead panel. Its true most cockpits are a health hazard.