*.pix3, *.pdb, *.pch, *.ipch, *.db, careful with this one: *.lib
these afaik are not picked up by the default visual studio 'clean build' command, however *.obj will (and probably *.lib if part of the build process, but have not verified).
“The sciences do not try to explain, they hardly even try to interpret, they mainly make models. By a model is meant a mathematical construct which with the addition of certain verbal interpretations describes observed phenomena. The justification of such a model construct is solely and precisely that it is expected to work.” John Von Neumann