I bought a "bargain" Porter Cable 7538 Plunge Router online a while back. On arrival, the plunge rods were frozen in their tubes. A soak in mineral spirits freed that up! The router seemingly ran just fine, but I tore the beast apart completely.
Good thing I did. The motor interior is completely coated with thick black gunk, thoroughly impregnated with fine aluminum shavings. The black stuff reminds me of hardened bee's wax.
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I hesitate to dunk the whole mess in a bucket of mineral spirits although my gut tells me it would be okay! Would electrical contact cleaner be a better choice? Whichever course I take, I will spring for new bearings when it is all clean inside. Then, my big "bargain" plunge router can earn it's keep.
Thanks for your input, as always!