Sometimes wear and tear can work in your favour. I own two basses because of this factor, and they're both my favourite basses. The first is my trusty Westone Spectrum DX which, when I got it, had been sprayed very badly with a combat green colour and was covered in crud. This is why I got it for 35 quid, because the bloke in the shop thought it was nasty bit of tat. But all I had to do was clean it and strip down to the very nice maple underneath, and it makes for a really good bass. The second bass is a 1989/90 MIJ Fender Jazz fretless (i.e. an unmarked fretless). I was at a party a few months back and spotted it in a room surrounded by loads of other crap. After a few inquiries I found the owner and had a look at it. It was absolutely filthy and had various dents and scratches on it. The owner wasn't a fan of it, so I said I'd take it off his hands. So he let me do so for 150 quid, which to my mind is a bit of a bargain (perhaps I'm wrong). When I got it home, it took a fair few hours to take it apart and clean it. The wiring was, well, shot to hell and most of the connections had just fallen off (but it still worked a bit through an amp). The worst thing was the crud all over it. The pickguard had to be wedged off the bass once all the screws were taken out. The same went for the bridge. They both stayed on because layers of sweaty skin crud were holding them there. Still, after a thorough clean, some delicate restoration on the fingerboard, and a replacement pickguard, it looks and sounds bloody marvellous. Sure, it has a few dents and scratches, but it still looks way way better than it did when I rescued it