I got tired of using a screwdriver or a putty knife to scrape clean my chain saw's bar grooves. The putty knife was too thin and the taper on the screwdrivers never got square to the bottom of the groove. I stumbled onto a length of angled strap steel that was 0.05" thick. Then I drilled mounting holes in the steel, hook shaped the end, and fastened it to a short length of hardwood:
Rather amazing how much better this works. I believe Stihl sells something like this, but this was a good rainy day project. I actually made two of them and gave one to a logger friend. Since this Pic was taken, I've drilled a 1/4" hole in the wooden end and added a 10" length of nylon cord in a loop for hanging it up.