Quote from: RustyRD on July 09, 2021, 07:10:14 PM
white vinegar 5% acidity will remove rust without over etching the metal. Eco friendly and cheap.
This. But to be fair, the acid will only convert the rust; not remove it. Some mechanical abrasion will still be required for removal. Before you do any type of converter (vinegar, Ospho, etc.) rinse the tank several times with Dawn and HOT water.
Although I have yet to try it, my body shop buddy swears by this stuff. No mechanical abrasion required. Locks loose rust in place and converts it. He does a lot of marine work but bikes as well. Says it works better than any Kreem or POR-15 stuff he's tried.
https://store.interstateproducts.com/products/Rust_Control/1_step_rust_killer_1gal?utm_source=bing&utm_medium=cpc&msclkid=cbd380173f571dcb49b0e0fdd3bb2e26