Yes it is believed that all sin are washed away if a person takes bath in great GANGES. Every year haridwar and rishikesh toured by thousands of tourist...As a HINDU i have the same faith too, But i go to those places as its really calm place and spiritually is their in the air.
But I know its a myth and how can someones sin can be washed away? Then everyone from haridwar or rishikesh would have gone to heaven..
As a human we should always try not to do any wrong doing and eventually with the humanities we ll one day goto heaven after death..
thanking you @saswat036