I've no idea what type of metal German belt buckles are made of - what's the best thing to clean them up?
You've got nothing to ein, zwei, drei, vier
soak it overnight in coca cola.
you'll be amazed how clean it comes up.
"I think we are in rats' alley - Where the dead men lost their bones."
It's the Phosphoric acid in coke that does it - which also explains why its so crap for your teeth....
When we were a Kingdom it was run by a King
When we were an Empire it was run by an Empress
Now we're a country we're run by a..........
There are two main metals used for belt buckles. Stamped steel and cast aluminium.
aka Stigroadie
AFRA
better by design
"Truth is a shining goddess, always veiled, always distant, never wholly approachable, but worthy of all the devotion of which the human spirit is capable. "
Excellent guys - Steiner Jr is being sent around to Tesco Express as I type!
You've got nothing to ein, zwei, drei, vier
I soaked some 'green' brass 37 webbing in cocacola and it came out like new.
Brown sauce and a foam/brillo sink scrub pad work well on metal work too...
"I think we are in rats' alley - Where the dead men lost their bones."
You could also do what a lot of German squaddies did in the field and paint it. My steel buckle was rusted after Churchills' Revenge and proved almost impossible to clean up. So, I gave it a good going over with wire wool, then painted it field grey. Hey presto! Easy to keep clean and no chance of it rusting.
When I want your opinion - I'll tell you what it is!
"You're mad," my son said to me. "Ha, just you wait and see - tomorrow morning they'll be like new..." Only they aren't! 
Sorry to say, the Coca Cola didn't do much at all - the buckles are still brown / rusty / oxidised. Before I go for another loopy suggestion like brown sauce and brillo pads, and endure the ridicule of my family once again.... any other suggestions?? 
You've got nothing to ein, zwei, drei, vier
The mistake you made was using farby Tesco own-brand diet cola, which won't do the job. CocaCola - It's The Real Thing....
* joke *
I used "The Real Thing", not diet, not decaf, not Tesco stripey...!
You've got nothing to ein, zwei, drei, vier
I'm amazed it usualy strips stuff in hours.
Try leaving an old tooth in a glass.....
"I think we are in rats' alley - Where the dead men lost their bones."
"You're mad," my son said to me. "Ha, just you wait and see - tomorrow morning they'll be like new..." Only they aren't!
Hammerite do an excellent product-think its called rust remover(what else!!!!)and comes in either a paint on gel or a liquid where you believe it or not dilute with water then soak rusty item.Used both and both worked well.
Once had an original dug up SS buckle which was just one cake of rust-the gel brought it back to fantastic condition
Good shout Taff. 
You've got nothing to ein, zwei, drei, vier
I just got one off Rhys - are they supposed to be painted or bare metal - which is more likely?
Either mate. They were issued plain, but some troops painted them.
You've got nothing to ein, zwei, drei, vier
Good shout Taff.
It worked for me and was well worth the money 
Best of luck with it
...... " Cilletbang "... not sure if I've spelt it right !........ shifts parked cars,... aswell as muck 'N' rust !!
No thats shit, if you want to do a proper job get some of this stuff.
Seriously check the demo...
http://www.youtube.com/watch?v=hCoO4D8Tk0o
"I think we are in rats' alley - Where the dead men lost their bones."
... No,..... these are better,... and much more fun,..... did a 2 ltr one ! Fooool !!
http://www.youtube.com/watch?v=AjEcjO5QjAU
lmao nice vids u 2