I second using hairspray, the more contact the better and rather using PLA over ABS.
I am now using Printafix which, next to coming in nice small canisters for precise application, adheres much better than anything else with 121 N/cm2 bed adhesion force.
Retail in the USA starts only next year but for those who can't wait I will be happy to take orders and ship them to you, for a small percentage fee