I've had good results using a jeweler's file to file down one side of the pivot pin and then use a 1/16 punch to tap out the pin. Granted there is always risk in removing a pin and you will have to peen a new pin as the old pin will no longer be usable. As for the scales, perhaps some pictures would help the members here guide you in the best method to clean them up for use.

If you are not interested in removing the blade to clean it up I would suggest listening to JimmyHAD and get some dental floss. It may be all you need.