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Hi twng,
WD-40 and silicon spray are not the right products as the first one has a carrier that evaporates and leaves practically no lubrication and silicon spray is definitely not a cleaner. Brake parts cleaner evaporates immediately within a couple of seconds and won't damage anything. The ultra-light lubricant should be in a spray form otherwise it will not get to every part. I don't know what other products would be equivalent to PL-100 but I will try to see what else you could use as this product is manufactured in Quebec Province, probably around Montreal. Just hold a rag around the ignition lock so you don't overspray other parts in the interior of the car and do the same with the brake cleaner as it would affect some plastic parts around the lock in the car interior. Otherwise, it won't cause any damage to anything such as paint or circuits as there are none inside the lock.
That is how I solved the problem and as I mentioned in my previous message, you should carry that can of lubricant in the car and spray every time you need to. It all depends on how many times you turn that lock cylinder in let's say a month, but eventually, you will not need to lubricate anymore. PL-100 does not evaporate like WD-40 and your total cost will be under 15.00$ including the cleaner. Changing the lock cylinder is ridiculous but obviously the way in which the dealership will guide you. But make sure you use strictly the products mentioned, otherwise you'll be running after trouble. Cheers!
Mike
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