Originally Posted by
headloss
Better safe than sorry... give the frame a bath, or flush it a few times with naval-jelly, or maybe even try electrolysis since you have several frames it might be worth the extra effort.
John Allen gives a good summary of options:
Bicycle Frame Refinishing
That is exactly what I mentioned with the plater. Give them an old piece of rusty metal a d he gives back the piece sans rust. The pitting will remain but rust is gone.