Lynne Edwards calls this block "Electric Fan" in her New Sampler Quilt Book but I know it as "Leila's Fan" from when Jennie Lewis made it for the BQL Pick 'n' Mix block swap.
I showed it to the others with partial piecing but finished it yesterday evening and steam pressed only for the iron to spit gunge. I rinsed it in cold water and "Vanish barred" it and left it to soak over night. To my amazement in the morning the gunge had vanished. Now thready round the edge but otherwise intact.