My Yashica GTN is in great shape except for the seals. Some Q-Tips type product, the height test isopropyl alcohol, and some tooth picks, and it went pretty quickly to remove the gummy remains. Bought some "foamies" at the crafts store. A sheet of 3 mm, and a sheet of 2 mm thick material. I probably could have gotten by with just one, but at 99 cents a piece I splurged and bought the thicker stuff for the door end seal at the hinge.

An exacto knife and a strait edge handled the cutting chores, and a fresh toothpick handled the inserting chore. I probably have enough to do another 200 cameras to spare, but it sure comes out pretty.