here are different ways to clean the injectors. Moreover, some injectors are dishwasher safe to. Although, for clearing up the needle, you need to clean it properly. First, fill up a bowl with hot soapy water and then fill the injector the same way as a marinade. Now eject the solution until it clear the clog.
After that, get a cleaning brush of the injector and insert it in the needle to thoroughly clean it. Now rinse with clear water and air dry to store for subsequent use.