I see that corrosion too but, according to my 200+ bushing dissembly experience, that corrosion isn't happening on every bushing. I'd say, 30% of them. and those are with cars that do outings in the rain/snow. I have a 360 that never goes into the rain and the insert (I called it the metal part) is like new inside! I am no pro, so I think I might benefit from your expertise, can we just clean corrosions and keep using them?