This educates you just how to ask Facebook to get rid of reviews from an organisation Page. Facebook will just erase reviews that breach their Area Requirements.
How To Delete A Review On Facebook
Steps
1. Open up Facebook. It's the blue icon with a white "f" in the app cabinet.
2. Most likely to the review you intend to remove.
3. Touch the downward-pointing arrowhead. It's at the top-right edge of the review. [1]
4. Click Report.
5. Select a factor. The review will only be deleted if it breaches Facebook's Neighborhood Criteria. [2] As soon as you select a factor, comply with the on-screen directions to send your request.