I had contacted the company that makes Magic Sizing to see if it had the properties of starch that would attract bugs. Here is their reply. I like it and find that it works well and is far less expensive than Best Press.
____________
Thank you for your recent email regarding your interest in our Magic Sizing fabric finish. We always appreciate consumer correspondence.
Some of our ironing aids DO contain natural corn starch and (when use on items stored over long periods) are more likely to attract insects and rodents. These products all contain natural corn starch: Faultless Regular Spray Starch, Faultless Heavy Spray Starch, Heavy Lemon, Magic Starch, and Faultless Sizing.
The Magic Sizing contains a synthetic film forming ingredient called CMC: Sodium Carboxymethylcellulose. This compound is derived from plant material, but the end product does not really physically or chemically resemble the original cellulose. Some critters can derive nutrition from almost ANYthing, but ironing aids without natural corn starch are less likely to attract pests. These ironing aids do NOT contain natural corn starch: Magic Sizing Light Body, Magic Sizing Extra Crisp, Magic and Faultless Premium Starches, and Faultless MAXX Starch.
Again, thank you for taking the time to email us. Should you have any other questions, we are always happy to help.
Sincerely,
-Renee-
Consumer Specialist