CAIG Deoxit D5 works wonders. just take your strings off, spray a tad on a cloth then rub the string down well. string 'er up then you're good to go. it's an electronics cleaner that works amazingly well on scratchy pots ect... it cleans the hell outta your strings too. bubbles up like hydrogen peroxide while it eats rust and dirt. the reason I take the strings off is to not get it on the bass.