Years ago I had a threaded coupler/lubing tool, you screwed it onto one end of the cable housing and pumped grease into it. Only worked for certain cable types. FWIW
On the the FZJ80 series, at least the 95-97 models IME, the actual cable inside the housing (the part that moves) is coated in clear plastic and as mentioned above is not removable from the housing. So for that type of cable assembly might not want to use strong solvents like Carb cleaner. The...