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Authorities are trying to figure out how workers will scale the Taj Mahal's 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 mausoleum's minarets and walls is almost finished, after workers began the makeover in mid-2015. They've been using a natural mud paste to remove yellow discoloration and return the marble to its original brilliant white. Called fuller's earth, it's the same clay that some people smother on their skin as a beauty treatment. But the metal scaffolding used so far is too heavy and rigid for the dome. Authorities are considering other options, including designing and constructing special bamboo scaffolding. Let us take a look at how to clean dirty Taj Mahal dome:
Rain was enough to clean most of the Taj Mahal in the past but air pollution over the last 25 years had taken its toll. (AP Photo) 
The dirt has became visibly clear and it was all yellow. (AP Photo) -
Tourists say this the most beautiful thing they have ever seen. It's a living, breathing thing that emanates the absolute beauty of the human spirit. (AP Photo)
It even started becoming black in the shaded areas not washed by rains. (AP Photo) 
Authorities said the work on the dome would likely take 10 months, starting next year and finishing in 2019. (AP Photo) 
The makeover was costing a total of about $500,000. (AP Photo) 
The work has prompted Fodor's Travel guide to include the Taj Mahal on its list of places not to visit next year. (AP Photo) 
The Taj Mahal typically attracts between 7 and 8 million visitors a year. (AP Photo) -
Built by Mughal Emperor Shah Jahan in memory of his wife Mumtaz Mahal, people are attracted as much by the love story as the spectacular architecture. (AP Photo)
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