"The front of the Apollo half time oven is black- maybe plastic. No matter what I clean it with it stays sticky and looks streaked and nasty."
The following only applies if the oven is ceramic coated metal. (not plastic or painted metal) Use caution on adjacent painted/plastic surfaces and laminate counter tops.
With adequate ventilation, solvent based cleaners like Brakleen, hexane, acetone, MEK (methyl ethyl ketone) toluene, xylene will cut through the oxidized grease better than household cleaners. Most of them are HIGHLY FLAMMABLE so beware if you are inside. The fumes MUST clear before lighting the range/oven or anything else.
Use gloves and lots of clean paper towels and the grease will clean up quickly.
The above cleaners are available at Walmart, Home Depot, local auto parts stores, etc.
Chum lee