Welding Tips and Tricks

Hi,
I found some older rod, aluminum, stainless, and brass. All of them have some dirt, rust contamination and general crap on them. What is the best way to clean them up, or are they no good?
Thanks in advance,
Buggsy

Scotch bright and acetone. Happy times.

Probably the brass you mentioned is actually bronze

Like Mike mentioned, scotch bright - but you could also probably also use emery paper if the contamination is severe. Stainless Steel Wool is also great for the aluminum.