H.N.
Hello, It seems you have gotton some good advice and have tried some good things to get them out. It may be time to use a live trap or have a professional wildlife trapper get them out. You may have already gotten this in other responses. If you use a live trap and don't want them to spray, I have placed old blankets on top of the cage to cover it while transportig the aniaml. I have had success with no sprays this way.
For mor information you can visit:
http://icwdm.org/wildlife/skunk/skunkpub.asp
There you can find all kinds of information on how to handle skunks.
Good luck.