A couple of thoughts:
One, post your location and perhaps one or two fellow Audiogoners (is that a word?), could perhaps help you out, either as a favor, or for a reasonable fee.
Two, as the owner of a RCM (Nitty Gritty 1.0), which while admittedly is not the best RCM, is pretty decent, I have found that there are just some records that will not clean up completely. Some of the dirt/dust/gunk just can not be removed from the grooves. (This is one reason why I clean all my records before I play them the first time.) Once the gunk gets deep into the grooves it is difficult, to impossible, to get out. And playing a dirty record is an excellent way of pushing the gunk in so far, that it can not be removed. (As well as soiling your stylus, which should be cleaned fairly often as well.)
In the world of Analog, cleanliness is a way of life.
(Which for a slob like me is tough!)
My two cents worth on the subject anyway.
Good Luck, and if you are close enough to me, I would be glad to help you out.