I generally inspect and clean the striker/firing pin channels on my 'working pistols' either annually or approx every thousand rounds. I don't use spray agents to clean these areas, but disassemble the slides, remove the striker assemblies or firing pins and then clean and dry the parts and the channel areas.

Of course, I take care not to introduce any solvent/CLP to that area during cleaning or lubrication in the first place. Using an excessive amount of either liquid agent can introduce the opportunity for it to migrate into the striker/firing pin channel (or under the extractor, for that matter).

This regiment might vary a bit depending on the conditions to which the pistols are exposed for shooting or carry, though.

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Ret LE Firearms inst & armorer