Hey, finally time to reply.
The printbed temperature of 60ยบ is a good start, make sure before printing, that you give the printbed a wipe with acetone. Acetone is one of the few cleaning agents that doesn't leave grease behind. I clean the print bed every week.
There are also other solutions, some people print PLA on Kapton tape, or on special blue tape. Some print on glass, and some print on a special surface called 'BuildTak'.
Here you see the wiki with more information on different build plate materials:
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reprap.org]
http://www.marinusdebeer.nl/