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I learned to sharpen bits on the side of a bench grinder wheel. It's much flatter and easier to control the grind. I also start on the cutting edge first and lower the back of the drill to relieve the metal behind the cutting edge. Using a coarse wheel will create less heat than a finer wheel will. The metal will be removed faster. Also always sharpen the bit without gloves so you can feel the heat if the bit is starting to heat up.
Try using vinegar.Many boat builders use it for cleaning up tools and such. Plus it's not toxic like some thinners are.
Gouges can be sharpened like a flat chisel. Just put the bevel down on the stone and push the gouge down the stone while rolling it from one side to the other. It's a little finicky until you develop a smooth roll.I only push the gouge and don't use any other motions. If you need a slip stone for the inside curve an Arkansas or wet stone can be ground to shape on a hard grinding wheel. Coarse works better than finer for this.