[R-390] Follow up/ corroded tube pins

[Scott Bauer]

 OK, I finally remembered to get to the store for some tonic 
water to try and get the heavily corroded tube pins cleaned
off. I had bought 10 tubes on eBay that I thought were ruined
 It worked better than I anticipated. I rubber banded the tubes
together and stood them up in a small tupperware and then poured
in just enough tonic water to completely soak the pins.
 I came back in 1 hour to check and the tube pins were perfectly
clean. No scrubbing or scraping was needed. I did rinse the
tubes off with water to remove the corn syrup though.

 I used store brand tonic water. Some brands have different 
ingredients. I just made sure the brand I picked had phosphoric
acid listed as an ingredient.

 Thanks to all for the good ideas, Scott