Two Scalli Mod tips
1) Before each session I smear cooking oil over the entire surface as it makes clean up easier. Hopefully everyone has heard this one.
2) The scalli mod tends to get black stuff on it even if you follow tip one and hot soap and water never get all of it off. The solution is a very small cup with a couple of inches of very water mix with two full tablespoons of powered dish detergent. Just let the mod soak for a couple of hours and it will be pristine clean.
These tips are suited to any sort of pyrex stuff including the smiley style bowls.