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Liqui moly - the stuff from Wurth group? https://www.liquimolyfrance.fr/
At those prices I hope they work.Think that modern diesels the whole system (lift pump in a fuel tank, fuel line and then higher pressure pump) is pressurised so the fuel system including the filter needs to be more air tight (is that right, increased pressure so that increased the susceptibility to pressure loss?) That is the think that I think that sealed diesel filters need to be emptied/changed more often.
lynx
Liqui poly diesel purge FTW. Hard to get in the UK, but used it on so many cars /vans to clean them up a bit. Doesn't fix bad timing /nozzles /pumps/compression. But does help sort out sticky pintels on mechanical injectors, gummed up nozzles, gummed up fuel pump advances etc.
Noticed many modern diesels the fuel filter doesn't have a water drain. Do all mine every 6 months and always shocked by the milkshake /emulsified mess that comes out the bottom (not a lot, likely only 20 to 50ml) of a diesel fuel filter. Can imagine the havoc that any decent amount of water would cause in a hp diesel pump.