[Arran]

Electronic contact cleaner is really just a blend of various alcohols, nothing really that exciting in it. I've washed coils before using a TSP and hot water solution. I did not scrub the coil or touch the leads, just dipped them, swished them around, and then dipped them in clean hot water to rinse. Then after it was air dried I remelted the wax with a heat gun, not enough to make it run but just to soften it and drive any moisture out. These were 175 kc If coils, absolutely filthy, and they are still working fine. I wash chassis with the same solution all the time, coils, IFs, and all, and never had any coil problems afterward, I just give them lost of time to dry out. You could spray those with alcohol, I can't see what harm it might do, the plastics are mostly phenolic based so the will not dissolve.
Regards
Arran