Remove Water Marks form an Existing PDF

Hi Team,

        Is it possible to remove "WATER MARK" from the existing PDF/Image.? using C#?
        I have tried using ASPOSE.PDf,PDFTRON etc. which supports to delete the water marks if they added using those Components.
But My requirement is to remove the WaterMARK(added by Thrid party tool..) from PDF.?

Thanks in advance. Help required.!

thanks
Satish