One of my hobbies in my younger years was car audio. In most of my older cars, I’ve typically installed head units with Aux-In capabilities to play or stream music from an iPod or iPhone. My go-to head unit is a Harmon Kardon Traffic Pro. The navigation is useless now that we have Waze and Google Maps, but I like the DIN size, simple look and matching BMW red lighting. I also usually use a/d/s amplifiers and speakers, which are not necessarily period-correct, even if the brand definitely is.
Over the course of months I assembled pieces of the system until it was time to finally install everything. This required removing a lot of the interior, except ironically the dashboard, which had already been through enough. Once all the seats were removed, it uncovered a secondary project, which was to detail the interior carpets. They had accumulated over a quarter-century of mostly coffee stains (pre-cupholder era), chocolate(?), and dog hair. Although the loose change found was not enough to compensate me for my effort, the payoff was a much cleaner car.
I couldn’t get out every stain with the steam cleaner I had. I’ve since acquired a new steamer that might be able to get even more, but perhaps it should be left to a professional with the right chemicals to get everything out (if possible). I also took the opportunity to clean up the front seat bases. Finally, people often comment that the rear deck is somehow blue, but really it’s just sun-faded after all these years. I used some SEM spray paint to bring it back to its Anthracite glory.