I can mixed vegetables. I was always told that it needs to be pressure canned according to the ingredient that needs to be canned the longest. Don't pack the veggies in to tightly. Leave room for your water (or tomato juice or meat broth--whatever your liquid is) around your veggies.
The processing time on this surprises me. I was always told to process for the time needed for the ingredient that took the most time. I thought corn usually took longer than this. Surprise, Surprise! I learned something new. I just did some research and corn's processing time is 55 minutes for pints and 85 minutes for quarts. (Creamed corn can only safely be canned in pints...I didn't look up it's processing time.) There was a vegetable/beef soup recipe that I like and wanted to add corn to it but was told not to because of the extra time needed to can. Now I wonder if it is because much of our corn is creamed???
Be sure to use the processing time required for the ingredient with the longest processing time.
You should be able to dump it either down your drain or outside. I've dumped it after using it to soak cucumbers for pickles. I like the idea below.