I use a great tool that allows me to easily clean-up 'mess' that Visual Studio generates when it compiles code.
The bin and obj folders are not always properly cleaned when using 'Clean solution' functionality from VS.
In such case there is a tool: Clean Source (http://www.codinghorror.com/blog/archives/000368.html)
Here is a description:
This application does one thing. It adds an explorer shell menu to folders that when selected will recursively delete the contents of the bin, obj and setup folders. If you have a .NET project that you wish to share with someone, this is useful to remove the unnecessary stuff from the folder before you zip it up and send it off.
I find the tool very useful. I believe you will feel the same (or you already know the tool).