Essential cinnamon oil.
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How Cinnamon Can Keep All Of Your Copper Pipes Corrosion-Free
While copper pipes are excellent for plumbing, without maintenance, they can become prone to corrosion. However, you can use a simple cinnamon oil hack to preserve them.
If you have any exposed copper pipes, you can maintain them by diluting the cinnamon oil with a bit of water and rubbing it on once every few months.
For the inside of the pipes, pour 10 to 20 drops of cinnamon oil down drains and let it coat the pipes for 30 minutes to an hour, before letting water run through them again.
Cinnamon oil helps preserve copper pipes because it is antibacterial and antifungal, so it can remove any harmful bacteria and buildup that might eventually lead to corrosion.