Personally, I don't believe any fuel injector cleaning additives are needed to keep the injectors clean like was needed until the mid-seventies. That is when the gasoline manufacturers finally caught on and all started including enough fuel injector cleaning additives in their gasolines, even in their low (87) octane grades. It wasn't long after pretty much all engines had gone to fuel injection that the gasoline manufacturers were coerced to finally include enough cleaning additives which they all did.
I used to have a bunch of Jeep and truck dealerships as customers and I made it a point to ask all the mechanics how many clogged/dirty fuel injectors they had ever seen. The old mechanics said it had been years since they had seen one and none of the younger mechanics had ever seen one.
Which doesn't quite back up car dealerships pushing those $99 fuel injector cleaning "specials" so hard and telling everyone how important they are.