rags....rags.....and more rags, put a little solvent on the FRI. nite rag so it can clean up a weeks worth of use, MON. morning as you come in for another week of work you well be glad you did. you'll never get it all off or clean just because the shop is working but you can steal wipe it down from time to time just to show the class act you are as a wrench, any color well show grime but black shows it less, steal try and wipe it down each nite to show pride in your ability to be professional, save the last work day to clean it off for the week.