You can get rid of mold by using bleach. Make a solution with a ratio of one cup of bleach per gallon of water. Apply the solution to the affected area by using a cloth or spray. Then, rinse the surface after some time. To get more suggestions, go to http://blackmold.awardspace.com/kill-remove-mold.html.
bleach and warm water. Saturate for 1 hour before cleaning. wait for it to dry then repeat the process. wait 12 hours and apply Kilz with a paint brush. oil base is better. Kilz is a oil base primer and stain blocker. The mold will return if you don't take care of the original problem. there's to much settled moisture. If its in the bathroom, check your exhaust fan or crack a window after showering.