Trying to Clean Drip Pans

So, I've been seeing pins on pinterest with ways to clean my gross drip pans. I am a messy cook. And these things are gross. I do want to add a disclaimer that we are renting our house & I have no idea if these were clean when I moved in. They probably were and this is probably all my embarrassing mess. I did some experimenting based on what I saw online. It was kind of a fail.

Peroxide, vinegar, baking soda. I poured a bunch of each in the sink with hot water.

I scrubbed the pans, let them soak, scrub, soak, repeat, repeat. They soaked for about 2 hours. I poured more of everything directly onto the pans and scrubbed some more. Then I ran them through the dishwasher.

An improvement, but not the results I saw on pinterest. Looks like purchasing new drip pans may be in my future.