Back in '82 when I took a mechanics course at Red River Vo-Tech School in Hope Arkansas. We used a product called Goo It, do it with goo it was the slogan lol. But it was for battery terminals to keep them from getting corroded with acid and losing connection.
It was very good, made to not interfere with the conduction of electricity and to last a long time. I coated every connection that I could.
Any how a few weeks ago I done a search to see if it was still made and believe it or not I found it online.
I will be getting some soon and trying it out to see if it is still good as it used to be!!
I hope you all are faring okay with the heat.