Very easy surface rust remover for chrome

[Toolmaker51]

Must be a chemical connection; especially with citric acid. The handcleaners with citric orange and mild abrasive work nicely this way. I get good results on grime what collects on machine tools - even on gun bluing, no hint of scratching. It wouldn't seem the abrasive is common pumice; Moh's scale is 6.0 near obsidian. Mohs Hardness Scale: Testing the Resistance to Being Scratched Can't hazard a guess on the foil. Rust is said to occupy 7x the volume of metal it displaced; explains why nuts freeze on a bolt, the two virtually bond. Rust breakers break down and convert or at least alter oxidation.