There are many ways to stop people from scribbling on monuments like the area around the monument should be limited for the tourists, secondly cameras should be installed at different places to keep a check on all the people nearby, thirdly some police should be ordered to be at monuments. As a police do petroling at night, similarly police should keep a check on all the tourists. I hope that these ways can help you in your situation.
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This is for ASL na
Hey !! Plzz mark it as best...