Too many redirects Homepage Problem

[FusionMediaLimited]

During a site move, a sub domain of website a redirected all pages to the homepage of website b.

resulting a homepage algorithmic penalty for website b.

The sub domain was deleted - and the sitemove for the main domain went through ok.

However website b has 80,000 incoming links from the sub domain of website a.

is there anything else that needs to be done to "inform" google that the mistake was fixed?

[ChrisAshton]

Assuming the links have been removed completely, then not really. It can take anywhere from hours to months before Google will "react" to those links having been removed.

If you're still seeing those links as valid in something like Open Site Explorer then don't forget these tools use their own methods for producing this list so it doesn't necessarily mean Google is still seeing the links.

About the only thing I can suggest is if subdomain a is still up and running without the redirect, submit it to index via Search Console; anecdotally, this really does seem to promote it being re-indexed faster so theoretically the removal of those 301s may be picked up faster if they haven't been already.

This can be found under Crawl > Fetch as Google.