The future is electric………….

[F4celess]

Stuff you just put into the tank with >20 litres of fuel. I'm using Wynns version. 'Diesel Injector Cleaner'. Cheap and seems to work fine. BTW mines an old diesel with no particulate filter.

I like to pour some of this stuff into the tank every now and then. Especially on a long motorway run, when you know the whole tank (plus additive) is going to be consumed.

Also found in the past running the car on "premium" (higher octane) fuel made a difference to performance/economy too.
It's also documented the higher octane fuel contains additional additives (much like the Wynns), which help clean out the engine of deposits.