Vinegar, an acid, will do the same thing as miratic. Albeit slower but light years safer for you and the environment. I had some tools that were left by my late father that had suffered flood waters following a hurricane. Some were badly rusted, some (the newer ones with chrome plating) not so bad. After soaking overnight, most cleaned up pretty good. The ones that were really bad, I left for an additional overnight soak. the rust was eaten away leaving them with a dark charcoal patina similar to the manifold pictured earlier in this thread. I even had a cresent wrench that was froze up before soaking. After with a shot of wd40, It worked like new. Yeah Miratic acid will take rust off fast but as has been suggested, its a hazardous waste. I don't have any worries pouring vinegar down the drain. Actually helps keep them clear too Disclaimer: I pour it through a funnel lined with cheese cloth to collect the solids. YMMV