i recently acquired a vintage frame of an unknown make built with some sort of lightweight tubing. it rides real nice, fits great, and is fully chromed, which i've always wanted. when i was taking it apart yesterday, i noticed the inside of the tubes and stays were pretty rusty, and i felt a little bit of pitting.

i want to clear the rust out and spray it with frame saver, cause i love this frame and dont want it to crack, but how can i do it? what would i use, and how would i reach down into the top tube, down tube and stays? is there nothing i can do except ride it till it cracks?

any advice would be much appreciated, i really want to keep riding this frame for a long time.