Do the two Pauls want me to point every grammar mistake they make?
Post edited, this one goes after you see it.
Replacing "Caig" with "Craig" is a spelling error, not a grammatical error. It is also a factual error, like referring to GF tubes, or calling BNC connectors bananas. If the brand name DeOxit was also used, there would be less confusion.
To get this thread back on topic, the Mr. Clean Magic eraser is quite good for cleaning tube pins. Caig DeOxit cleans oxidized metal (whether on tube pins or other connectors), and Caig Gold supposedly prevents corrosion after treatment (I have never personally verified this). The two come packed together with small cans of each. RadioShack usually has that two pack.