I just picked up a new (used) Travel Trailer ;D and found that both the 7pin plug on my Suburban and the plug on the TT are very dirty. I thought about just replacing them both but and loathe to change the plug and cable (single unit) on the TT if I don't have to. The one on the TV will be changed anyway because the housing has a crack. Is there a way to effectively clean the oxidation and gunk off the contacts or should I just get out my coveralls and start chasing cable? ???