WWHere can I buy retro clean?

I had some blocks that were yellowed with age. I would not work with them in that condition so I soaked them in Tide with bleach for a couple days They came out white as snow and the stains had all disappeared. I think you can still get the Tide with bleach.

What about using a zigzag stitch to attach to a piece of muslin, preferably prewashed and then wash. I would prewash the muslin so it is preshrunk.

Another vote for Retro-Clean which can be purchased online or at some LQS.

Great blocks. I got some 1930's Sun Bonnet Sue blocks from a friend - yes, original to the 30's! I soaked them in cold water and OxyClean. I would soak for overnight, empty the water and gently press out the excess water (no wringing) and then soaked again. It took about 4 soakings but they came out really nicely. They are on my to do list for this summer.

Good luck with your beauties!

Getting them clean. Now how should I piece?

RetroClean. YES! One soaks the fabric in it...so there wouldn't be the problem of the agitating from a washer. I use a storage tub to soak my quilts in when I use RetroClean.

Since there are 20 of them, I would probably arrange them 4 x 5 with sashing and a border. What is the size of the blocks?

8.5 or9" not sure

Retro clean on Amazon: https://smile.amazon.com/Retro-Clean...ds=retro+clean