Google will remove fake reviews if they are satisfied it breaches their content policies.
If a review is posted that very clearly violates a policy, it is possible for it to be automatically detected by Google as a fake review and removed instantly. However, this is very rare. Given the large amount of reviews that are posted to Google, it’s very likely that fake reviews go unnoticed.
Therefore, it is often necessary for us to prepare an application to Google which demonstrates that the specific review is indeed fake and in violation of content policies. While this application is not always successful on first submission, if it is evidently fake then our team will.