Any help for a pyrex pan with baked on grease?

I have had good results just soaking overnight in baking soda water.

Many thanks for the great advice! I really appreciate it! I'll let you know how it goes..

Congratulations! You've made. . .plastic! For real--that's what oil of any kind (canola, margarine, petroleum) turns into when it's heated.

I do what cazcancook does. I also use a paring knife to scrape off any residue stuck to the seams.

I have alway had great success with a pre-soaped steel wool on pyrex and corning dishes that grease has been baked onto. I first scrub a little getting some grease off and the soap on the pan, then let it set and return in 15-20 minutes. The grease comes off with more scrubbing rather easily.

When you used the oven cleaner, did you heat the pan? It works better that way and perhaps a second go 'round with the oven cleaner while heating the pan will do the trick. This worked great for me for a steel pan that was used to fry a turkey, the outside was one huge burnt on grease mess! Applying heat made all the difference.

You could trip placing several papertowels in the dish, and then pour just enough ammonia to soak them. Then tie the whole mess in a plastic bag and allow it to sit overnight in a location where the fumes can be wafted away. Open bag carefully after 24 hours, the grease should be softened enough to removed.

Another product I have used that is less sticky is De-solves-it Contractor Strength. It's an orange oil product that works really well. But it's harder to find. Have to go to a hardware store. It may take several applications.