I made a tablerunner for my sister for christmas. Almost done and iron spewed rusty brown on the light green/pink block. I made a paste with powered oxy - came out great.
It did it again all over the block when I was doing my final pressing. This time alot worse. It took 3 applications, but it all came off. I just rubbed it on with washcloth.
Hope one these ideas gets it out for you :D