Copper pipes are strong and durable, but they can still become damaged. If you notice green marks on the outside of a pipe, it is usually a sign of corrosion that can occur when copper comes into contact with air and water over time. If you leave it, the pipe might become weaker and start to leak.
Use White Vinegar
Put some vinegar on a cloth or sponge and rub at the green marks. If they do not come off, leave the vinegar for a few minutes and try again. You can also try mixing the vinegar with salt to make a paste as this can help remove tougher marks, but it will not repair damaged copper pipe fittings. Water with a low pH level can cause copper pipes to wear out more quickly.
Use Acetone Carefully
Acetone can remove stubborn corrosion but always wear gloves and open a window while you use it. Wipe a small amount onto the pipe, then wash it off with warm soapy water and dry the pipe. If the green marks keep coming back, or you notice leaks around copper pipe fittings https://watkinspowis.co.uk/products/copper-pipe-fittings-and-press-systems, this could potentially indicate that there is another problem that needs to be checked by a plumber.
Try Lemon Juice and Salt
Mix lemon juice and salt until you have a thick paste and put it on the green patches and leave it for 15 minutes. Then wipe or scrub the pipe with a soft cloth or brush, rinse with clean water and dry the pipe.
