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In this Tuesday, Dec. 5, 2017, photo, Indian workers clean the discoloration of the Taj Mahal caused by environmental pollution in Agra, India. Authorities in India are trying to figure out how workers will scale the Taj Mahalís majestic but delicate dome as they complete the first thorough cleaning of the World Heritage site since it was built 369 years ago. Work on the mausoleumís minarets and walls is almost finished, after workers began the makeover in mid-2015. Theyíve been using a natural mud paste to remove yellow discoloration and return the marble to its original brilliant white. Called fullerís earth, itís the same clay that some people smother on their skin as a beauty treatment. (AP Photo/Manish Swarup)