If you have a lot of time on your hands, when the cube seems to be slowing, disassemble the entire cube, Wet a parer towel, and rub down all the pieces, including the core. When that's done, get a bunch of q-tips to clean the insides of the cube. Depending on what lube you used and how long you've had the cube, you might see the q-tips getting black really quickly. That's the plastic from the cube which has worn off of the pices. Then, to get the rest of the lube off, repeat the q-tip step but coat the tips in rubbing alcohol.