How to remove the rust plastic pipe
Just hit it with a pulse heating machine
The so-called "rouge" is actually "rust".
The main component is rust and oxidation of ferrous and ferric oxide, hydrochloric acid, ferric chloride and water generation. Iron chloride is soluble in water, so it can be washed very clean.
Rinse with dilute hydrochloric acid of 0.5% concentration, once.
