In the past I have used the Citrus based gel from Resteco. When I called to order it that have discontinued it.
For the past couple of years I have been immersing parts in Rust911 liquid. It works wonderful. I even used it to clean my cooling system. But as a water consistency liquid it isn't good for body parts. So I need a gel. Rust 911 doesn't have one so Evapo-rust is my only choice. I'll let ya know how it works out.
Here is my rusty project.