More about the fumes: if you use it in a closed space like a garage, the fumes can attack everything metal in the area, if the exposure time is several hours or more.

After I left my shop for the day, a quart or two of vinegar leaked on the floor and put surface rust on every piece of steel in the room by morning. And this was just vinegar, not nearly as strong as typical store-bought dilute muratic acid.

Yes, Evapo-Rust isn't cheap, but all things considered, it's very popular for a reason.