Regarding Disavow tools

Google disavow tool doesn't remove your spam backlinks, it only sorts your backlinks which are causing harm to your website. You need to remove the backlinks manually to get back your rankings in search engines.
 
Google will develop in the following months a tool to disavow unwanted links to your website. I think this will help some sites recovering and also make your competitors harder to hit your website.The disavow tool does take some time to work. The offending pages with the dodgy links need to be recrawled before they get disavowed.
 
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