Combining The URL Removal Tool With The Basic Tools
Google’s URL Removal Tool only removes the content from their index for 90 days, so it is not permanent. It is important, therefore, that you take additional steps to make sure that content does not come back into the index. You need to combine its use with one of the Basic Tools discussed above. Here is a table that represents how I look at the choices:
Tactic
When to Use
URL Removal Tool, Plus Deleting Pages and All Links to them, Plus 301s to Best Fit Pages
Always the best choice if there is no need for the pages to exist and if you are able to eliminate the pages.
URL Removal Tool Plus Rel=Canonical Tagging
The best remaining choice if preserving PageRank is a priority; however, you can only use this when your pages are a true duplicate or a strict subset of the pages that the tags point to.
URL Removal Tool Plus NoIndex Tag
Use when preserving PageRank is a priority, but the Rel=Canonical tag is not appropriate.
URL Removal Tool Plus DisAllow in Robots.txt
Use when reducing the number of pages that the search engines have to crawl is the priority.