The stains are blue pen and permanent marker. Thanks in advance

Google is really your best friend in this case.

Hairspray works to remove stains. Spray and rub; it's not going to come off easy. I had to use it on some green ink stain that was on my faux leather F/sn bag when I got it. As long as it's not rubber... if it's rubber, permanent marker tends to set in and won't come out.

Edit: Adding this link too...involves lots of chemicals though: http://www.ehow.com/how_5099022_remove- ... astic.html