Actually, frozen links on an Oring chain can be loosened with ACF50. The reason they stick is because they are rusting, because the lube people use is not getting through to the inside behind the Orings. Heavy chain lubes, like Chain Wax, and some other thick ones, are noted for this. PJ1s fame, as it were, is because it is thin enough to get behind the Orings. ACF50 will too, and it removes the rust, freeing the links. Don't use it as a lube, just a cleaner. Unfortunately, water is thin enough to get behind the Orings and wash out the original lube, especially if one is using a pressure spray to wash the bike.
Bare