This morning, I checked the piece of flex track and turnout that I worked on yesterday evening with the baking soda and toothbrush. The corrosion is completely gone from the turnout and only visible in a couple of places on the flex track. So I believe this method is going to work. Come on and get here, brass brushes! I only have 5 more turnouts and around 40 pieces of flex track to go, lol.
Not sure what I did, but apparently deleted the post from earlier today. The brass brushes are indeed the ticket but did not arrive until January 15. I mixed baking soda with water to a toothpaste like consistency, scrubbed the track with the brushes, then rinsed with water. I dried the track with a hairdyer on low heat, but high fan. It is working great. Some of the more corroded pieces took a second cleaning. I have cleaned all of the affected turnouts, and 25 pieces of the track. I only have about 20 to go, lol. So I'm going to try posting a pic of the cat pee flextrack, along with some cleaned pieces.