When you start pounding the cow tendons then you will see what I mean. They are quite greasy. Washing the tendons before pounding and shredding wouldn't do much for the fat that is inside the tendons and it would do much to the lumps of fat on the outside. Once you have shredded the tendons, separate them into bundles. Then you can wash them just before use with the dish soap and rinse well with warm water. That way you can just dip them in the glue right after the wash and then lay the bundles onto the back of your bow
Thanks Marc. Great info. Good to know before commiting