Not the best site for fast replies mate, try the other forum or fb groups.....
I would start high and drop you price if you need to, depends how desperate you are to sell. Its worth what someone will pay so anywhere between 2 and 10 cleans.
Ive sold work before at 4/5x as i wanted rid fairly sharpish but i wouldnt sell my best work for that.
A lot of people still think they should be paying 3x, personally i would rather dump it at that price
As for where to sell it, put it on here, other forum, fb groups, fb marketplace, ebay and gumtree.