Short story.
My buddy is a mechanic. He says he sprays a few squirts of Electrical switch cleaner into the ignition, or any switch that is having problems. 90%of the time, he says it fixes it. I have used it on the ignition of an old civic I had. it worked. I have not needed it on the FR-S yet.
I'd choose the brand you trust. I have some CRC.
https://www.google.com/webhp?sourcei...itch%20cleaner