Maybe you guys can help me, i got my new gallon of calhoun plastic from del. It doesnt mix well like the first gallon i recieved from him.. No matter how much i mix it , it does cook like the other gallon it alway has a sudsly looking foam on top, can anyone help me get rid of the way it cooked now. I use a purex and mic. i was alway able to set my microwave to 3 1/2 mins. for a perfectly cook plastic, now it just doesnt cook the same.