How To Clean Piano Black Speaker Finish?

Millercarbo I will certainly not let you near any of my Porsches. Stereo 5 you are going a fabulous job if you have not got swirl marks so far.
Instead of using water you could use an instant detailer like Meguires 34
which has a little wax in it and will remove finger prints. If you polish the surface do not wipe in straight lines! Polish in brisk circles never staying in any one place. Here is the reason. If you wipe in straight lines the swirl marks you generate will all be visible from one angle and from that angle the finish will look like absolute crap with hundreds of straight line marks. If you wipe briskly in circles constantly moving, the marks you create depending on the light will only have very short segments visible at any one angle in a very random pattern which is not near as noticeable as all the marks going one way. If you do develop swirl marks Menzerna 3800
will take them out safely with a clean microfiber cloth and polish the surface at the same time. Autogeeks carries Menzerna which is the German version of Meguires. The difference between a scratch and a swirl mark is the swirl mark you can not feel but the scratch will catch the edge of your finger nail. If you were to get a scratch, leave it alone. The paint on this stuff is very thin and it would be easy to rub right through it then you have a real mess. It would have to be filled first then flatten out which is a whole other process
Millercarbon, Paint cleaning clay is only for use on the most contaminated surfaces before rubbing the car out. I never use it on my cars because they never get that contaminated because nothing ever sticks to them 
(CQ UK 3.0) Clay is a swirl mark generator. Mequires #4 will take the paint right off his speaker. He would use Meguire's 205 (they changed their numbering system just to confuse everyone.)

Actually Millercarbon I have two, a 2006 Speed Yellow C4S my daughter named Smiley and Rudy a 2014 Guards Red Turbo S. Rudy won last years Make a Wish contest!  Give me a site and I would be happy to send you pictures.
b_limo you take a polisher and go at your car with #4 and see what happens. Please show us the pictures when you get finished.
I feel that when someone gives advice on how to destroy a subwoofer it is my duty to bud in and correct things before the inevitable happens.
Fortunately Stereo5 seems to be doing just fine without our help. Stereo5 just stick to the Mcguire's 34 detailer. It will remove the finger prints and leave a nice shine it also makes a great furniture polish. 
Oh and b-limo take out the Bo and add an A. Thanx,

Mike

b_limo, you are absolutely correct taken in context so I owe Millercarbon an apology. No I have never won a concours, just a Make a Wish contest.
I am sure the mini was a PIA. Who the f--- would do that to a Mini. The Cooper S is a really fun car. I think it may be the best handling FWD out there. It certainly is the best I have ever driven. Porsches are great if you work on them yourself. If not they can be a money pit. I have plenty of scraped knuckles to show for it. Audi just announced they are finally going to bring the RS 6 Avant to the US. Boy am I going to have a hard time passing that one by. The ultimate stealth mobile:)
Anyway, what kind of finish did you use on the Kefs, precat lacquer? Gutsy thing to do.
I have watched several episodes of AMMO. Very informative. I think he is in NYC where there are plenty of megabuck cars for him to work on. He drives a 911 on track. Smiley has the cup car nose and wing. I have had him on track several times. Rudy is too scary for that. He goes beyond my capability real fast. 
Stereo5 they are always going to say that for liability reasons lest you use something like brake fluid on em melting the finish off. Trust me on this one, an instant detailer like Meguires 34 which is mostly distilled water will do an excellent job, not harm the lacquer at all and leave you with a nice shine. I use it on my subs all the time.