“Always keep your knives sharp and your files clean.” I added that last bit, but regardless of who says it, it still holds true. A clean file cuts faster, saving time and frustration. To keep your files in top working order, you need to get your hands on a file card like this one from Woodstock International.
This particular file card sports polypropylene bristles on one side for cleaning rasps and removing dirt and rust from files. Stiff metal bristles on the flip side will remove embedded filings.
You shouldn’t have to pay much more than $6 for this or any file card.