Here's the short version. Two points: do not use alkaline cleaners on your carbs (or other aluminum parts, for that matter) if you do, or if you need anything cleaned/resurfaced, send your parts to Restocycle (http://www.restocycle.com) Here's the long version. I've got the tank, bodywork, and airbox removed from my 85 VF1000R for a quick carb sync when I notice that every time I crack the throttle I get a spray of fuel out of the #4 carb. It's as if there's pressure built up inside the float chamber and opening the butterfly valve would cause the carb to sneeze fuel as the pressure equalizes. I think to myself "ok, I've got a clogged bypass hole or idle circuit or something". So I pull the rack, disassemble the carbs, and prepare to put them in the ultrasonic. I've had some success cleaning carbs before using a solution of Simple Green and water, but I notice that I'm out so I head to Auto Zone to get some more. While there, I see the bottles of Simple Green sitting next to some Super Clean (the purple stuff) and decide to conduct a side-by-side effectiveness test. I get home and look at the label on the purple bottle, and see that for auto parts it recommends full strength (no water). Like an idiot, I fill up the ultrasonic with full strength purple demon urine and drop two of my carbs into the cleaner. At that point I noticed that the solution is starting to bubble like a freshly opened coke and I start to read the label with a growing sense of dread. After some frantic googling, I learn that Super Clean is highly alkaline with a PH of 13 or so, and that it'll eat through aluminum and other soft metals if given half a chance. I realized that I should neutralize the base with something acidic and so I submerge the carbs in a white vinegar solution and then thoroughly rinse them with water. I then put them into the ultrasonic with water and detergent and cleaned them like normal, trying to pretend that nothing had happened. Well, the next day, I found that the aluminum was covered in a dark, chalky aluminum oxide powder and that salt crystals had started to form all over, and that all the ferrous metal pieces were quickly rusting. At this point I realized how far out of my depth I am and started looking for an expert. I'd seen some posts on another forum for vapor blasting services from Restocycle with some pretty impressive photos of their work, and thought I'd give them a try. I just got an email with some before and after photos and I just had to post them here. The above photo is the before, here's the after: If you're in a bind, I'd HIGHLY recommend you send your parts here. The owner (I don't want to use his name on a public forum, but I'm certain that if you send him an email he'll introduce himself) was a pleasure to deal with, has an obvious love for these old Hondas as we do, and really is just a stand-up guy. Plus, the pricing is on the low side of reasonable. I think I'm gonna start sending him whole motorcycles, piece by piece.