Google penalty on my site - How to remove?

dude , maybe good removing unnatural links. but why you must remove nofollow links to??
you think nofollow tag links same as unnatural links?
Nofollow Tag links that make your Website Links Building look natural.

My Friend,
There are different things that you should take in consideration to recover from lose of rankings.
Let me tell you some basic things :

Firstly : check the competitors link (Do they have HIGH PR links (In content links)? If yes than there may be the point.
Secondly : Do you have in-content links : if yes, do they have good pr and Domain Authority?
Third: Do you have links with so called co-citation method? (It is one of the best methods right now to gain rankings).

Anything you need to know, just let me know as i’ll try to help you.

It is near impossible for this to cause any problems, otherwise that logic would mean that I could take out all of my competitors by spamming their links.

There is no need to remove bad links, just try Google disavow which can remove all of that links which are comes from low pr or bad websites to your site. Then make new strategy of link building with quality and authority backlinks.

Thread closed, as the OP seems to have lost interest.