Injector cleaning

Hello good I have a fiat point 1.9 diesel 60 hp I would like to know how I can clean the injectors of this car, since the products that I sell in the gas stations have tried them in other cars and they were still the same. I have heard that the sunflower oil mixed with the diesel works but I do not know your response, a greeting and thanks for everything.

Hello Jesus289, in this issue of cleaning injectors, as you have seen, the products do nothing, nor do you create the sunflower oil ... the injectors are difficult to get dirty as easy as it is believed (for something the filters are), throwing additives, apart from doing "nothing", they can even be worse.
When there are injector problems with many kmts, the problem is usually made of needle wear, injector grabing or spring tarado problems. The only way to do something effective with these is to check the tarado and regulate it, check that the needle slides without problems and checking the flow, if not, new injector; There is no more. The cleaning always seems like an "extra" that are taken in the workshops, so without further ado ... If you have smoke problems, you also have to think about the pump. Greetings!!