Contact Cleaner vs Brake Cleaner

On our '65 Valiant Signet converbible, tracking down a driver's side front turn signal problem, I finally was able to isolate it at the firewall (light green wire). Hard to get anything in there to clean and no more contact cleaner on the shelf. I found two, almost empty, cans of brake cleaner. Sprayed the contact until the cans quit on me a few seconds later.

Ran a jumper wire from the firewall contact to the lamp and now it went bright (before only measured a few millivolts and no flashing). Might only be a temporary fix.

Anyway, just wondering what the difference was between brake cleaner and contact cleaner? Should I invest in a can of each? Thank you.

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