Not sure if there are any places that show how to clean and maintain TT's. First get your supplies...
1. q-tips or other swabers to clean out the bearing and other little areas
2. Glass cleaner, furniture cleaner, isopropyl alcohol.
3. 2-3 microfiber towels, maybe some paper towels
4. compressed air
Remove the TT cover, put it aside
remove the main platter, put aside,
remove belt, try not to touch it much with your hands, put it aside
remove sub platter, put aside
Spray the TT deck off with compressed air. Then take a MF towel, spray with cleaner, clean the entire deck.
see, that little hole where the sub plater went into? blow some compressed air in there, then take your swab, dip in the iso, clean that area. Might have to do it 2-3 times till the swab is clean. Then use a naked clean swab to get anything left over. Blow in more compressed air. Then use the paper towel with some iso on it to clean the sub platter shaft, also the sides where the belt goes. You can also clean off the belt gear on the motor.
Use a little bit of lube on the shaft, and a little bit of lube on a swab, swab the bearing. Insert the sub plater. It might hang in the air when lubed, I "spin" it on, it should spin very freely, and slowly go down into position.
Reinstall belt, try not to paw it too much
Clean the platter on both sides, reinstall
Take the compressed air, and blow out the tonearm bearings, try to put a tube on the compressed air, to get into the little areas.
Take your glass cleaner, spray the other MF towel, clean the dust cover, reinstall
Then check all the settings on the tonearm. Anti-skate might be off, as well as tracking force. If you haven't in a while, might as well clean the needle. A blast of compressed air is good, but not too close, and do it from the back forward. Then use your needle brush.
Re-lube the bearing every few months. But always clean it first.