Looks pretty rough here. I sprayed it generously with industrial cleaner and let it sit a spell.

The 70+ years of use was no match for the cleaner. The underside was pretty rusty too.

I didn't have anything to soak these in, so I used the bathtub. In went the pieces with six gallons of vinegar, topped of with very hot water to cover. After sitting three hours I took my roll of aluminum foil to the tub, wadded up a piece and wiped. (Wiped, not scrubbed). It cleaned it down to bare metal! Some spots needed a bit of a scrub, but 97% of this wiped right off. Now this DID stain my tub. I cleaned it up with a magic eraser and a bit of Dawn.

I used mini bungee cords to hang the pieces to paint. This is the primer.

Then four coats of paint and three coats of sealant. I use dish gloves when I spray paint. Keeps the mess off me! I thought of doing a different color, but no. This pays homage to grandma, so I used original colors.

The finished product! I believe grandma would be pleased. I took my time with this, making sure each coat was dry before proceeding. It took a week, between work and home. I think it was time well spent.