Copper Water Pipes Home › Forums › Public Forums › General Plumbing › Copper Water Pipes This topic has 1 reply, 2 voices, and was last updated 24 years, 8 months ago by SylvanLMP. Viewing 1 reply thread Author Posts 27 Mar 2000 at 11:22 pm #272733 MasterPlumbersKeymaster How does or What does a person use to clean the Blur/Green buildup on the external side of copper water pipes in a home. 29 Mar 2000 at 1:52 am #286209 SylvanLMPParticipant Very fine steel wool 000 or 0000 AND or Never dull or brasso metal polish. Now if your talking about just cleaning it for soldering/brazing use emery cloth and a good paste NON acid flux. sylvanLMP SylvanLMP Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In