Bee's wax- get it at any hardware store. I use this for bearing edges.
Re-Percussions' 'Glide' is a mixture of Bee's wax and lanolin - good stuff for bearing edges.
Parrafin doesn't penetrate bearing edges but should be OK for t-rods although it won't prevent corrosion.
I use Vaseline on t-rods after a soak in Dawn liquid followed by the thumb nail. Vaseline is petro-based and tends not leach away like oil.
Probably anything mentioned above works OK if used sparingly.