A lot of the products in the States are hard to find here, maybe this will help:
We used this stuff,
http://www.amazon.com/Permatex-81756.../dp/B0007TQW5G
The stuff is bright pink, so you know where you've been.
I'll dig up some pictures tomorrow to show the difference. Did it on a ruffler and some other attachments. The ruffler was rusty and almost seized right up. It's usable now, if not pretty. It will dull the finish, and you will want to oil it like others mention to keep it from rusting more. Some of the car people that use it say Naval Jelly protects the stuff they use the rust dissolver on. I don't know anything about naval jelly though, if it would work here or not.