Remove untracked files including build products

In my company we use -x to let clean checkouts be as close as possible to clones without incurring the overhead of a clone. The difference with the current setting is that untracked files (build products) will also be removed. I think that's appropriate. The git-clean man page says this about -x: "This can be used (possibly in conjunction with git reset) to create a pristine working directory to test a clean build.". Please contact me if you have any questions. Thanks!