The dirtiest hotels in the US and UK from Trip Advisor

[lawren2 Malibu Beach Barbie & A Super Moderator Find all posts View Profile Close lawren2]

Dirtiest Hotels - U.S.
Hotel Carter, New York, NY
Ramada Niagara Falls, Niagara Falls, NY (Hotel now closed)
Nashville - Days Inn Vanderbilt / Music Row, Nashville, TN
Red Carpet Inn, Fort Lauderdale, FL
Regency Inn & Suites, New York, NY
St. Augustine Beachfront Resort, Saint Augustine, FL
Travel Inn Civic/Medical Center, Miami, FL
Eden Roc Motel, Wildwood, NJ
Days Inn Lancaster, Lancaster, PA
Pacific Sands Motel, Santa Monica, CA

Dirtiest Hotels - U.K.
Nanford Guest House, Oxford, England
Manor Court Hotel, London, England
Britannia Hotel Stockport, Stockport, England
Europa Gatwick, Crawley, England
Whiteleaf Hotel, London, England
Park Hotel, London, England
County Hotel, Carlisle, England
Britannia Hotel Birmingham, Birmingham, England
Eden Plaza Hotel, London, England
Britannia Country House Hotel, Manchester, England

TripAdvisor's 2008 Top 10 Dirtiest Hotels

[dougp26364 Senior Member Find all posts View Profile Close dougp26364]

I wonder how they compiled this list and what evidence they used that these are the dirtiest hotels in the U.S./U.K.?