Retain Dhaka's beauty even after T-20

I remember during the 2011 World Cup, Dhaka city was cleaned and made presentable before the visiting teams. They were even overwhelmed at how much cleaner Dhaka had become compared to what they saw when they last visited the city. Unfortunately, as the world cup ended and all the teams left, Dhaka city returned to its old filthy state.    
Now in 2014, Dhaka is once again preparing to host the T20 World Cup. It is again being beautified and cleaned to make it presentable before all the visiting teams. I hope this time the city will be kept beautiful, clean and liveable long after the tournament ends.
Aminur Rahim
New DOHS
Mohakhali, Dhaka