Re: Cog rust
For light rust, ... Vinegar works fantastic and is dirt cheap. There are lot's of video's on youtube explaining how to do it.
The only down side for myself, ... I really hate vintager in every way imaginable with the exception of cleaning up rust, ... that damn smell, ... ugh!
It's also good for putting in your radiator every now and then. Keeps the rust at bay inside the engine and radiator.
Regards
Bill
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