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My name is ***** ***** I have been repairing appliances for over 40 yrs and I will be assisting you tonight in trying to find out why your appliance is not working. Sometimes, there will be lapses in my replies back to your because of the volume of questions I am answering. But, please be assured that I will be giving you my best effort to help solve your problem.Give me a few minutes to check out the info you have provided.
The black goo as you describe is a combination of grease, detergent, and other dirt that does not dissolve in the water, usually because the supply water is not hot enough. Newer dishwashers have provisions to heat the water during the wash cycle, but I don"t think your machine has that feature. You need the water heater in your home to provide water at least 135 degrees, 140 is better.
My guess, is that is you take a paper towel and scrub along the backside on the bottom of the door, you will scrape up a handful of that stuff.
Your only option is to just clean it out. It is a relatively easy matter to remove the inside liner on your dishwasher by just removing the screws around the perimeter of the door and lifting the inner panel out of the machine. You will have to unplug the vent and detergent dispenser power plugs before pulling it out. Once you have it out, you can take a good degreaser and clean the bottom ridge and the bottom of the wash tub. Then just plug back in the wires you removed and reinstall the screws and you will be good to go.
Then just to give a good finish, buy a good dishwasher cleaner in the grocery store where you buy your detergent.
Let me know if you have any other questions.