I have organised my BNC adapter drawer. I gave everything a good scrub with isopropyl too.
So I asked about cleaning cables over here and apparently the material on the outside of a typical cable is PVC (Polyvinyl chloride), AKA “vinyl”. The jury is still out on what the best cleaner is for vinyl, but options include WD40, IPA, and metho (ethanol). I was worried that such solvents might damage PVC around electrical cables, but apparently it won’t.