Well, I agree about drinking it if it doesn't work. :}
I tried Mary Ellen's Best Press. I loved the bottle. It is the right size, never clogged, and held enough for each project. I used the unscented because of allergies.
However, I did not care for the starch itself. Although it did not leave flakes, I didn't think it gave me the pressing crispness I was looking for.
I use Faultless Premium Professional Spray Starch from the grocery store. It is a 20 oz. can, no flaking, and comes in a Pure Cotton Scent that is fresh and clean.
I have never had the needle clog up, always wash the quilt prior to use and try to iron the top as best I can.