I recently opened up my DSi internally. It was really dirty inside with screws and metals getting rusty, cables looked like they got chewed up and there is some slimly substance around which I couldn’t figure out. I gave what I could to clean it up and just wondering if in future will this situation happen on my other ds? Where should I store my electronics(NDSL/3DSXL/2DSXL) so that it’d be working perfectly fine even after few years?