First time caller, long time listener. (also, sorry, If I could figure out how to indent on this thing I would)...

I just ruthlessly scored a Major on the craigy. It is difficult to describe my excitement about the whole deal: I spent the last week watching shillers outbid me for $450 Super Jolly's; I spent I don't know how long making minute between shot adjustments on my beat up silver Mini (witch I also scored off the craigy, and which I also thought would be the END); I even ponied up for that damn funnel...
The guy had the thing buried in a post for airpots: "There is also a Mazzer Luigi grinder for sale..." He had to put me on hold for a minute to find out what model it was. When he told me it was a Major I negotiated the deal sight unseen.
I just met the guy this morning. Two things made the hair on the back of my neck stand up as he pulled the thing out of his car: 1. It is the grocery model (I've still got that funnel laying around here), and 2. IT'S BLACK! Unfortunately the day took a bit of a downturn on the way home as my Camry was overtaken by the smell of rancid HAZELNUT! (Remember, this thing was used for airpots)...

Sorry for the story...

I dismantled the entire burr carrying assembly (completely caked). Not content to simply soak, i threw all the parts in an SS stockpot and boiled them with a teaspoon of Puro Caff until the suds died down, stirring several times (45 mins?). I brushed and soaked the grinder cavity with rubbing alcohol. Rinsed the hell out of the burrs and baked them in a 250 degree oven to dry them out (figured I'd treat them like my cast iron)...Then...

First problem: The upper burr carrier (Aluminum) came out of the boil completely discolored, tarnished? I scrubbed the hell out of the thing until it stopped leaving black residue on my dobie. Attempted to use abrasive metal polish...still discolored.
Oddity: The lower burr carrier (also aluminum) spent the same time in the same boil being stirred around and came out...completely polished and sparkling.
FIRST QUESTION: Anyone have any idea if the discoloration will have a detrimental impact on the coffee beans or my health?

Second problem: Of course.....The thing still stinks of hazelnut.
SECOND QUESTION: Now what?

@johnb yep, it was full of coarse ground.

Morning after: probably not good idea to mix SS + Steel + Chrome + Brass + Aluminum + trisodium phosphate in boiling water....

Ha! While searching "cafiza ingredients," this popped up on CG:

Ciclisto wrote:Cafiza is an aggressive cleaner, containing trisodium phosphate and other compounds. It does not attack all metals -- it is fine for stainless steel, chrome and brass, which are its intended uses. It does react with aluminum and zinc (coating on galvanized steel), and should not be used on those metals. You maybe able to restore the shine on your aluminum tamper by using a metal polish formulated for oxidized aluminum. Try a hardware store or auto-parts store.

I guess I just have to assume that the mass of the upper carrier acted as some kind of anode and attracted all the contaminates from the lower carrier? Maybe the lower carrier was touching brass or something and....

The main problem is that it still stinks!

Of course.....The thing still stinks of hazelnut.

Which parts still stink? Where the metal parts are concerned, once you've removed all coffee residue with detergent (PuroCaff or the like), the stench should be gone, so I assume you are referring to plastic parts (hoppers/etc.). They will be much harder, perhaps impossible to purge fully. I've had drip carafes/lids/etc., in storage for several years, that still smelled (if less strongly). Same thing happens with plastic food containers used for smelly foods. The smelly substances are strongly held by the plastic and are not very volatile at room temperature. Three strategies come to mind. #1 will be harmless to parts. #2 and #3 may be destructive, depending on how hard they are pushed......

1. Absorption: pack parts in finely-divided dry material that will hold smelly vapors as they diffuse. I've heard of people using shredded paper, sawdust, baking soda, activated charcoal. Raising the temperature will increase the diffusion rate. I don't know how long it might take for an acceptable outcome, perhaps days to weeks, if ever.

2. Volatilization: essentially a slow oven-bake at the highest temperature you dare. Risks: deformation, embrittlement, fire, stinky house. A brief and mild version of this would be one or more hot-water washes in an automatic dishwasher (away from heating element, which usually means in top rack). Again, rate unknown.

3. Solution: immersion in a solvent liquid which dissolves the odiferous compounds without degrading the plastic. Not knowing enough about polymers in general, much less your specific materials, I have no concrete suggestion here. Risks: same as above, plus possibly combustible vapors.

Out of boredom, and to follow up. I did manage to find a big cache of old coarse ground hazelnut in the case when I opened it up the --second-- time to tap a couple holes to line up the funnel correctly. After removing this and after grinding a few weeks of good beans, there is no noticeable trace of the old coffee.

Thanks.
That is all.