my ecigarette except for the contacts and if I do it is rarely. I just think this looks cool. Jose Olivo took these pics for me. He cleans them most weekends. Check out Jose Olivo's mod collection. I just know that it looks really cool polished and cleaned. He uses BlueMagic 500-06 Metal Polish Cream - 19 3/8 oz.
You can clean tanks too for better taste and performance.