Prevent removal of .foam cases with cleanCase function

Right now, when executing any of the ./Allclean sripts, a cleanCase function is called deleting also any files with extension .foam. These files are used for ParaView to read OpenFOAM cases, and is quite handy to keep them when debugging OpenFOAM runs. Is it possible to prevent the deletion of these files? I understand ParaFoam creates files .OpenFOAM, but we are talking about .foam files.