One common issue we see with disavow requests is people going through with a fine-toothed comb when they really need to do something more like a machete on the bad backlinks. You may need to sacrifice short term revenue to get back to a place where...
Well, according to Google's Distinguished Engineer Matt Cutts, which was shared by John Mueller, a Webmaster Trends Analyst at Google, webmasters should be tackling URLs for the disavow tool with a machete instead of a scalpel.
It’s more time consuming, and takes more effort, but it may be worth taking a scalpel to your back links instead of a machete. Things that never used to "hurt" a website are now bringing businesses to their knees.