[ It seems Grandma sewed on it until just before she died at 85. Now to figure how to remove the layer of hardened grime without hurting the decals.
You can gently wipe the grime with a cotton ball soak in the waterless handcleaner "Goop" (without pumice) available at Walmart and lots of othere places. Just go gently to be sure that you aren't scrubbing the grime into the decals. Another way is to soften the grime with clean sewing machine oil and gently wipe the grime away with cotton balls. The cotton balls won't scratch like fabric or paper towels.
Texas Jan