Ever since I got my current bass last year,I stopped playing with my old yamaha 4 stringer and just had it on its stand next to my currently played bass. I just have it there on the stand for about 12 months now,in tune with no special protection whatsoever,I just pick it up every 2-3 months or so and wipe it clean with Dunlop 65 I use on all my guitars and basses and then setting it on its stand,promising I'd put something like a bag over it to at least protect it from dust. never did though. I just picked it up to clean it today and I noticed some rust (?) marks on the pickups and on the last 3-4 frets that I couldnt seem to be able to scratch away. It's just a few tiny marks here and there but they got me worried. what's the best way to take care of the bass you're not playing at the moment? lay it strings down on a bed? hard case? detune? no strings at all? even selling it? I don't see myself playing with it anytime soon to be honest.