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A clean of the poles and the runners they go through should do it. Metho on a tissue and a bit of elbow grease. It dries very quickly with no residue. This should reduce any resistance you're finding. DON'T use turps!
The only type of lubricant I've ever seen used, and have used myself, has been good quality car wax on the bearing surfaces (not the Teflon pads, but the surface they run over). You may want to apply this to the corresponding surfaces of your dob. The difference this makes is amazing. Just clean these surfaces first too before applying the wax.
I apply this car wax to the altitide and azimuth bearings of my 17.5" dob once a year. How it restores its original silky smooth movements is extraordinary!
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