I would clean the bike and take the best pictures you can for the add. I would not put a dime into any bike i was going to sell. Just make sure the price reflects the condition, give someone a good deal and move on.
I tried to sell mine for the same reason, too many bikes and the 950 does not get enough use. I have way over 10k in it with low miles and 2 sets of wheels I was asking $8k and got offers closer to $6k. Decided to keep it over loosing $4k. Next time I will take everything I can off it and take $6k for it.
2011 690 Enduro R
2013 Beta Evo
07 450 EXC