Normally when you are going to iron your fabric, you wet it, or starch it, roll it up and put it in a plastic bag. You then put it in the refigerator--not the freezer, and iron it a day later. If you wait week it is just like the week old mystery food, it molds. So leave it in the fridge 1 night-maybe 2 days, and iron.
If you use spray starch, I suggest turning it over after spraying it as well, but for a different reason. The starch builds up on the top of the cloth and if you iron it it will brown, just like your potatoes in a skillet. If you don't take it off the heat (as in the pan) it burns which is what happens to starch on your iron. So I spray and flip. I also watch my plate of the iron to be sure I am not building up a scorched iron. If you are, get a wash cloth wet it and set it on your ironing board. Then iron the wash cloth, turning it and 'scrubbing' with the cloth. Mine usually go away.