back links removal

As per google penguin, all the low quality back links are going to affect the website SERPS hugely. So, we need to find all the bad back links and then remove them one by one.
What I would like to know is, what tool do you use to find all the bad back links ?
And how do we know which is a bad back link or bad website, where our link should not be there ?
Then what service what do you suggest for back links removal.
I contacted LinkDelete.com and they quoted me 97$ for a month to remove all…
back links removal

See original post by QubeSys Technologies