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I work in a kitchen. There is a lot of flour dust. Phone goes in my pocket port up. After a year the build up is enough to warrant a cleaning due to issues.

You can also block any slopsite that makes it past so you only have to see it once.

Why? Type-A is worse from a safety standpoint since you can install Type-B upside down to avoid ‘metal object falling into loose plug causing a short’ situations and is (from my understanding) part of the reason the US switched off a Type-B style. I’m not informed on Type-C or Type-F but those ones also look like they don’t guarantee polarity (not always an issue but it can be).