How do I 'clean' a Visual Studio 2010 C++ solution,
so that it is small enough to be zipped up and sent as an email attachment?
Is there any other way to send large MSVS C++ files over email?
For making size smaller:
bin, obj, Debug and Release folders (or delete the folders themselves).Notice: If some files have been manually put in the bin folder by the developer for the program to work make sure you don't delete it. If it's not your own project: Normally there are files of type exe, pdb, ilk, lib, dll, exp, vshost.exe, manifest, that can be safely deleted. But if you see other things, such as mdf or mdb databases, images, text files, etc they shouldn't be deleted.
At the root of the solution or project there might be a big .ncb file which is Intellisense's database and can be safely deleted since it is recollected next time you open the project. A user options file with .suo is there that contains the environment and editor's layout and settings. This can be deleted too but it's usually small.
Finally, make sure you use a good archiver. Zip is very common but is not as good as formats like gzip, bzip2 or 7-zip.
Sending projects via e-mail is nice to send your homework to the professor, but as others noted if this is a team work, you must consider using some (distributed) version control system among your team.