01.) Download the icon (Drain_Plug.ico) from either of the following sites:-
http://www.mediafire.com/?tb348incn8v26tw
or
http://www.multiupload.com/ZZA8U18FGD
02.) Save the downloaded (Drain_Plug.ico) to a convenient directory - as an example, let's assume the following directory:-
C:\Users\Your User Account\AppData\Roaming\Firetrust\MailWasher
03.) Next, just follow the simple instructions in the following illustration:-
04.) After clicking 'Change Icon,' browse to the directory (C:\Users\Your User Account\AppData\Roaming\Firetrust\MailWasher) where the Drain_Plug.ico was saved and then select it
05.) Restart MailWasher Pro 2011 and that's about it.[/color]

Important:
You need to configure your 'Taskbar buttons' to 'Always combine, hide labels.'