Ignition wiring clean up suggestions please

Electronic/ electrical cleaner used to be essentially the same chemical as brake clean and parts cleaner. And round up some alky. You can buy this

https://kleanstrip.com/heating-fuels/denatured-alcohol/
Klean Strip denatured alcohol in quarts and gallons at HD and Lowes

NOTE: THIS IS NOT the same as Coleman fuel and cannot be used for such. It might be used in some alcohol stoves

We used that product extensively where I worked building electrics/ electronics for the power wheelchairs we sold

I WOULD NOT use carb cleaner, most thinners, lacquer/ paint thinner, acetone, or MEK