Go to a hydraulics shop and talk them out of a couple of vanes from a vane hydraulic pump. Then you need a handle. A heavy equipement wrecker should have old crawler steering clutch handles. Then get a bolt that fits the handle threads, and cut the bolt head off and weld it to the square edge of the vane. Install the handle with Loctite. Now rough sharpen the angled edge of the vane. When ground to a sharp edge it is not straight enough. Now use a sheet or two of emery cloth on glass to sharpen similar to how you would a knife. This will give good wearing scrapers for almost nothing. The pump vanes are hard and retain an edge well. Vanes from different size pumps will give you different width scrapers. These will outlast those expensive tool.truck scrapers by far.