Interesting. I have this recipe from Mark Lipinski (he was a guest on Simply Quilts). I wonder if the cornstarch in your recipe could be put into this concoction:
Lavender Linen Water Recipe
Combine:
2 cups of distilled water
2 ounces of cheap vodka
15 to 20 drops of 100% essential oil of lavender
(available at health food stores) or another 100% essential oil scent
Make sure you’re using 100% essential oils! Accept and use no substitutions!
Add the mixture to your steam iron and enjoy the aroma while you piece. Store the leftover water in the fridge.