Kindly advice on the best product I can use to clean the injectors in my VW Golf mk4, without having to manually remove them. The golf has a 1.8 20V AGN engine Thank you
Scotty has mentioned the ATS "505 CRF" fuel system treatment to be effective. If that is not available in your area, a PEA-based cleaner such as Techron would be best.
https://www.atscarbonclean.com/pour-in/

As @chucktobias mentioned, that is the best option, but a little harder to get than some others that work okay.
Another option if you can't get the ATS 505 is Royal purple, they make several types that are usually at walmart. Scotty has made videos showing that they do work. They have techron at walmart as well.
the best product I can use to clean the injectors i
the "best" way to clean injectors is to run the cleaner right through them
https://www.youtube.com/watch?v=bKGI9N_yWd0
I don't know how fast Scotty aged, but it might be a problem to get that injector tool and it's fluid 'Sledge Hammer' by now.
You missed the point.
Getting fuel injector service is not a problem.