Dear colleague, there are many products in the market to clean injectors with buoy, such as Würth and Wynn's. What you should know is that if the vehicle is modern, p. eg. With two lambda or oxygen probes, one before and one after the catalyst, it can happen that during cleaning with the buoy, the light of the Chek Engine of the instrument board is turned on because the Lambda probe or oxygen sensor does not detect a good combustion. To turn off that capable light that you have to resort to an official service of the brand so that by means of the appropriate scanner the light (a thousand) or of contamination warning. In those cases it is best to disassemble the injectors and clean them by ultrasound. LUCK HECAN.