injector questions

[Brandon Rogers]

Guys-
My injectors have probably 195,000 miles on them - assuming they are
original.  I've been thinking about sending them in for rebuild to RC
Engineering or someplace like that.  Curious what exactly those guys do
versus me just pouring in some Fuel injector cleaner - BG44K or
something....??  I'm getting ready for a 400-500 mile roadtrip in a
couple days.  Any good results with any specific FI cleaners?  Snake
oil?
 
Any additives that clean out any carbon deposits?
 
TIA-
 
Brandon
'84 urquattro 20Vt
'01.5 S4