I thought 5.56 was our resident internet military instructor?
Oh well, i will submit a few things that i have seen/ tried/ or neglected in the past with mess tins, dirty, pre field inspection;
Tea bag from your brew works a treat
Rub the black carbon off the bottom of the mess tin on the grass/ dead leaves/ sand etc
You can pack a film case with some washing up liquid and cut a brillo pad in half and if you have enough water you can do a fairly domesticated washing up thing... but people will laugh at you... but then again you wont have the runs or dysentry
Alternatively you can buy those gucci non stick black mess tins, a delight to clean and also very good for you spec ops sneaky beeky super ninja warriors!
I find licking the good blackness off the bottom, washed down with a good '78 sauvignon, with crushed hexi for hors d'euve goes down a treat. Try leaving your tongue exposed for a while for it to dry out so you can really scrape away at the carbon nutrients on the bottom. Once you've had mess-tin blackness you'll never go back.
For the inside I recommend leaving it unwashed for months, then fill with a good range stew (good = everything in cookhouse that was 2 days past its best) and wolf down, scraping all mould and BSE ridden beef away with some lovely plasticcy sunblest. It's even better if the norgie the range stew came in has been used recently for tea/coffee/toffee/curry/beans as the residue in the seals adds extra zest.
Good luck with your future cleaning L/Cpl 5.56 *salutes*
I find using someone elses mess tins to be the best solution simply swap them over when done, preferably in the middle of a live fire section attack, the happy look on their face for letting them be allowed to clean them during this slow paced dull event will leave a glowing sense of satisfaction knowing that you have made his day ................................................................
That or just buy a gas cooker you seem to have every other item of kit under the sun!
Is that because you used to have your lunch money stolen? I'm sure you could have a long chat with 5.56 about this. He may also suggest ways in which you can wreak revenge with special sas/ninja/james bond style kicks and knife fights that will cause them to die by just looking at them etc
Tin foil, two pieces one for the bottom, keep black hexi at bay by wrapping around the bottom of the mess tin, second piece on top keeps heat in while boiling up. Just fold up both pieces, don't forget which is which though, when you are finished. Both bits can easily last 2 weeks in the field. Still got to clean the inside but If your using boil in the bag its not a problem