Rust from cassette and chain I was cleaning my chainring, chain and cassette with vinegar,
to remove unwanted grease but suddenly after a few minutes it suddenly turned slightly orange. It spread all over my rear gears.
I got worried so I put light oil; it worked but still has some light rust on it.
What should I do?
The rust is only cosmetic surface rust. I would ignore it.
In future, don not use vinegar as it is quite acidic. A proper degreaser will clean the chain and running gear without causing rust.
Oiling the chain is essential after cleaning, mainly to provide lubrication, but also the oil prevents rust. It is best to use a proper bicycle chain lube, as (what I think of )
a light oil is too light to provide the lubrication needed (much better than nothing if its all you have available).