How to display Web Part Maintenance Page in SharePoint

The web part page starts behaving strangely or giving you errors due to script errors or web part. This sometimes even stops you to open page in edit mode because of Java Script errors.
There is a very simple way to delete those web parts. Try  appending  ?contents=1 at the end of the URL of respective page and SharePoint opens the Web Part Maintenance Page.

For example, if the URL of page with issue is :
http://MOSServer/Test/default.aspx
then ,the Web Part Maintenance Page url will be
http://MOSServer/Test/default.aspx?contents=1