Unplug replug many times did it for me plus electrical contact cleaner...(you can find it at Maddison/Addison even Canadian Tire)Going to repair my car this weekend. The honk worked yesterday but not today.
How would you clean the contacts? Is an air can from Dollarama enough? I got the grease already.
If you want to put grease use Silicone grease (dielectric) nothing else...