This is a very common question and often the mostly commonly used type, WD40, is the wrong choice. I’d be rich by now if I had £1 for every time a customer had told me their lock was still sticky only after a month of using WD40. The problem is that it simply drains out of the padlock very quickly and loses its lubricating properties after a short period of time.
Most locks that are very sticky or even totally stuck will come back to life after using the correct lubricant, although it can take a couple of days to have full effect. As always, prevention is better than a cure so lubricate your lock regularly even when there is no signs of rust or it becoming sticky.
Rather than going into great details we though it might be easier to explain via a video:
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