Also, (for whomever reads and responds to the first post) I have a couple of ball point pen marks on my light colored (Deerskin colored) cue case. What might take them off without (further) harming the case?
the lexol leather cleaner is really good. the follow with the lexol leather conditioner. you can get touch up markers for leather to cover up some of the scuffs and worn areas, i have one from Mohawk.
I've never tried removing ballpoint pen ink from leather, not sure if the lexol cleaner would be effective on that or not. I did see this though that might do the trick: http://www.metroguardian.net/shop/guardian-ink-+-lipstick-remover-for-leather-c-11-p-76.html
i've heard of people using rubbing alcohol and various other household solvents, but this had a pretty chance of damaging the finish and color on the leather. supposedly the ink sticks won't damage the leather's finish.
Don't be shocked. I use WD-40 to clean the glue off of leather wraps after installation. Works very well in that situation. I can't say about it's usefulness in others however.