I've used a Sentry Tuf-Cloth on my knife blades since my first RSK Mk1 many many years ago. Great stuff.

To this point I've been using 3-in-1 oil on folding knife hinges relatively infrequently, but after reading so many recommendations to use Sentry Tuf-Glide on knife hinges I finally bought their needle tipped bottle.

Now I find myself wondering exactly how to convert to using Tuf-Glide. Should I somehow remove the previously applied oil first? If so, how do I safely de-oil the hinge? My first thought was brake cleaner spray, but I've read it can harm plastics. Then I wonder if I should dip the hinge in rubbing alcohol. Any advice?