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You can use window cleaner or rubbing alcohol. Simply wipe the tang down with your desired solution, and let it dry. Be careful not to handle the tang with your bare hands after this.  Rubbing alcohol will work the best, but you can use window cleaner too. You don't have to clean the wood scales. The wood is porous and textured, so it will take the epoxy readily. You can do this with a metal file or even a screw. You don't have to be precise for this step, but you should wipe the surface down once you are done.  If the scales are smooth on the marked sides, it would be a good idea to scuff them as well. You can also roughly sand the scales with 120-grit sandpaper. Make sure that you are only sanding the sides that will be touching the tang. Each brand of epoxy glue is different, but in most cases, you will need to mix equal amounts of "Part A" and "Part B" in a plastic, disposable cup. Work quickly. Most epoxy glues set within minutes.  Make sure that you are using epoxy glue, and not epoxy resin or coating. Mix the epoxy using a disposable tool, as it will ruin whatever you use to stir it. It would be a good idea to wear some plastic of vinyl gloves too. You can buy epoxy glue in hardware stores. Some craft stores may also sell epoxy glue. Use a disposable knife or paint spatula to spread an even layer of epoxy onto 1 side of the tang and the marked side of the matching scale with epoxy. Press the 2 together. Working quickly, flip the knife over so that you can see the other side of the tang. Insert the pins into the holes. Coat the tang and the marked side of the remaining scale, and press them together.  You may have to hammer the second scale into place to ensure a tight fit. If you want to, you can coat the pins with epoxy too. This will make the bond even stronger. Make sure that you are inserting the handle between the pieces of plastic wrap--this way, the excess epoxy won't get everywhere. Close the vise as tightly as possible. After squeezing the 2 halves together, all the excess epoxy will have leaked out. Dip a rag in acetone, and use it to wipe off any epoxy that has leaked out from between the 2 scales. How long this takes depends on the type of epoxy you are using. Some are set and ready to use within 1 hour. Others need up to 1 day to dry. Check the label on your package of epoxy for complete drying times and instructions.

Summary:
Clean the tang on both sides to remove any oils or dirt. Scuff the tang on both sides to give the epoxy some texture to stick to. Prepare the epoxy glue according to the instructions. Glue the first scale to the the tang with the prepared epoxy. Insert the pins and glue the second scale. Insert the handle into the vise and clamp it shut. Wipe off any excess epoxy with a rag soaked in acetone. Allow the epoxy to set.