Before I bought the new nozzle, I tried cleaning my old one for a long time. I used 3 solutions.

-Isopropyl alcohol (limited cleaning, soaked for a day)
-Cider vinegar (worked well, soaked for a day, increased flow 25%)
-Glacial vinegar (probably worked well, soaked for a day and seemed to increase a little bit more than the Cider vinegar)

I think if I soaked in the glacial vinegar for another day (replaced the solution after the first day), I think the nozzle could have been almost completely cleaned. Unfortunately, along with the wiper dye, some of the coating from the nozzle came off with it. The effectiveness of the solution is best displayed in the picture below of the bowl.

Shot of glacial solution after one day (notice the blue color from the dye)


Comparison of new and old nozzle (notice the coating on the old nozzle)


Close up of old nozzle


Before you guys decide to work with glacial acid, I just wanted to warn everyone that care should be taken during the handling of the acid. The smell is overwhelmingly powerful. I smelled the vinegar before I opened the box from a tiny leak that didn't even penetrate the plastic wrap that the bottle was packaged in (wrapped in plastic with packing material in the middle with another layer of plastic wrap!). The acid made my bathroom smell like a salt and vinegar potato chip factory. It was bad and when you accidently get a good whiff acid it burns your nasal passages. I strongly recommend putting the acid in an airtight container. I ended up putting the solution and the nozzle in a small pie tin and placed the pie tin in a tupperwear container. When handling the acid I didn't notice that I had a small cut and when the acid made contact with my wound, it burned. It burned very bad. I can only describe the pain as what I think hand gonorrhea would feel like. Becareful.

 

I'm careful to run distilled water but good info to have. Every spring when I get the car out of winter hybernation I change oil, coolant, clean the IC and intake filter etc. Maybe I'll add this to the spring "routine".
Probably just stick with cider vinegar though.

 

I find that the nozzles are so cheap, it isn't worth it. I didn't notice it but it's incredible how much clearer the new nozzle is. It sprays so much more that I may retune. My AFRs are low (10s).