I don't know what brand of cue you have, but most shafts are shipped with a sealer on the shaft, to keep out moisture. This sealer will eventually wear off & is slowly replaced by the sweat & oils from your hands. If you are cleaning the shaft often with a Magic Earaser & some kind of liquid, you will strip away the protection & you will have to lightly sand the shaft with 1000 or 1500 grit sandpaper, burnish & then reseal the wood. Don't be anal about cleaning the shaft. It is supposed to look that way. Once sealed, maintenance is easy. Before you put your cue in the case LIGHTLY wipe it with a SLIGHTLY DAMP paper towel. Then clean the chalk off of the tip (so it doesn't turn your case insides blue...JER
P.S. A good sealer is RED DEVEL SHELLAC, thinned 3 or 4 parts denatured alcohol to 1 part shaellac. Use a table spoon to measure.