Hi guys I'm cleaning up my bike and could use some help removing the rust. I'm using vinegar for the unpainted and smaller parts which works great but the parts start rusting again almost immediately after I wash them off. What are some things I can do to prevent this?

Also, I'm trying to get some rust off of the forks. I am hesitant to sand the area for fear of removing the grooves. Is the vinegar approach safe for the paint? Other suggestions?

Thanks