You can extend the life of your broadhead file by chalking it when new and repeating this process after every cleaning. I learned this little trick from my 9th grade Metal Shop teacher, Mr. Grubb.
When you file a broadhead, or any metal object, small shavings build up in the ruts or valleys of the file. This is called pinning, which can get so bad that it renders your file useless. The use of chalk helps reduce pinning and allows for easier cleaning of your file and a longer life. Any type of chalk will work.
Apply an even layer to both sides of your new file and make sure you clean your file often with a metal brush to remove the metal shavings that build up on top of the chalk. I like the small, fine, toothbrush-sized ones. Remember to re-chalk your file and you’re ready to go.