I put them immediately in cold water. No luck. Then I sprayed Shout on them. No luck. Tried white vinegar and then CLR.
I had just sewed 10 blocks in a row for the first row. And the seams needed pressing open. So after I had done that, I turned the row over and was pressing it nicely from the front. When the deluge happened.
3 blocks got it really bad. I can remove those blocks from the row if the stains don't come out. But I'm not sure I have enough fabric to remake them.
Another reason for NOT buying kits.
I saw a tip online to use lemon juice and salt to make a paste and lay it in the sun. But I have no sun and won't for about 4 days.
Also there was a caution about this bleaching colored fabrics. This is a QOV. So I do have reds and blues to worry about.
That's a great tip about not putting water in the iron. I've learned my lesson the hard way. Pretty bad when you can't use water in a steam iron.
This is the second project mishap in as many days. So it might be time to just walk away for a few days.