I wash mine from time to time. That makes for an improvement. Folk here will recall me turning up at Billings with bits of straw still plastered all over it from the previous week’s adventures.
I keep meaning to replace the stereo for one that accepts iPods, but other more important stuff keeps on getting in the way
I have added some Karmann badges and decals, just to give the manufacturers of the car some credit. They used to give them away for free - I’m not sure if they still do this now.