The problem isn't so much the injectors getting dirty and building up parafin, but the carbon build up in the cylinders and on the valves.
Seafoam and the Lucas additives will help reduce the buildup. I use Gumout Regain to do the same thing about once a month.
Seafoam and the Lucas additives will help reduce the buildup. I use Gumout Regain to do the same thing about once a month.