Now im not talking a few months grime/shit, im talking about something that looks like its never been cleaned, its completely black, not even a tiny speck of silver can be seen

Ive tried what i normally do on my cars, a old cloth and AG metal polish but its not touching it, so would i need to use wet+dry paper on it? would that work?

I wouldnt let mine get this bad but i bought the car like it(rest of the car is very clean)

 

Try some wire wool and metal polish

 

I'd give tar remover and something like jizer to break down the actual grime. agitate it with a toothbrush or something similar and let it soak for a while and keep repeating.

I've found with metal polish its great for bringing a shine up if the metal is relatively clean but doesnt do much if the piece is still covered in shite.

 

Try brasso. I've used it many a times on my exhaust and it works a treat. If it's really bad then let it soak for around 10mins then it should come off with a bit of elbow grease.

 

Use autosol and wire wool works a treat

 

Yeah don't think brasso etc is going to touch this

Wire wool it is then

Cheers chaps

 

Wire wool + metal polish

 

Soak it in WD40, then attack the pipe (NOT the mirror boxes) with a wire wheel on a grinder.

This will remove all of the shite and you'll be left with a dull stainless steel, then use a set of polishing mops, sisal wheel, mild then finishing mop and with the correct grade compound's

then it'll look like this after around 3 hours,

 

If its really bad soak it on Mr Muscle first for a while (but please dont get any on your plastics or paint work) the attack it with wire wool & metal polish

 

Wowsers that is immaculate under there!

I used to use tar remover and brasso when i did mine in the past

 

Another vote for Mr Muscle spray oven cleaner. Will break down the heavy carbon deposits and then finish up with some metal polish (Peek/Autosol etc) with wire wool.