Pictures: Washing the Fort McHenry tunnels
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"Unimogs" at work
Two German made "Unimogs" clean the ceramic tiles throughout the left hand south bound tube at the Fort McHenry tunnel. It is a continual process from April through Thanksgiving through all the tunnel tubes. It is a ten pass process using a 6 foot brush similar to what is used in a car wash. This process takes a week per tunnel. They use approx. 60,000 gallons of water (total) per night which is then run through the city's sanitation system. The state has three of these quarter million dollar machines, which has the ability to be used as a snow plow and grass cutter. Once the "Unimogs" have gone through, two water spraying trucks follow for rinsing the tile. This is done for appearance plus much better reflective qualities which will show the brake lights of vehicles around the curve of the tunnel. They use a solution called "soot-be-gone" added with to water for their cleaning solution.