Do you mean the paint cup? The paint cup interior on mine discolored no matter what I used as cleaner, including the Medea cleaner. I never submerse or let my AB soak - just clean it thoroughly after each use. Only takes about 10 min.

I have had my Iwata HP-CS for about four years and have disassembled and cleaned it "religiously" after every use. Now the funny thing that I'd like to point out is that except for the first few cleanings in which I used the Tamiya Airbrush Cleaner (#87089-500) I have regularly been using "Windex w/ Amonia-'D' " with NO ill effects. A couple of more points to consider is that I only use the Iwata with acrylic paints (Tamiya, ModelMaster), do not soak the parts and rinse them with clear water after cleaning.

Cheers,
Jan

I had issues with my airbrush clogging up, I use a variety of paints, and it was causing me some grief.

Took apart and cleaned, I do not know how many times.

Went to my local art supply, where I bought the airbrush, and they tried helping and we figured out that one of the Createx paints I had tried, with a Createx thinner, had caused some reaction with the paint. The paint clumped up into a ball in the thinner, imagine what that did inside the airbrush.

Bought a Iwata airbrush cleaner refill kit and used it, the actual airbrush cleaner kit is about one hundred dollars, I mean really that is another model, so I used the kit, great instructions inside and some cool little tools, and rarely have a problem, except for Vallejo primer.

Grab one of those refill kits, you will not be sorry.

.... What I do is after I finish priming, full the cup with windex and scrap out the primer skin that forms inside with a Q-tip. Then run the rest of the windex through he nozzle....

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.... What I do is after I finish priming, full the cup with windex and scrap out the primer skin that forms inside with a Q-tip. Then run the rest of the windex through he nozzle....

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My method virtually mirrors yours with the Windex and Q-Tips. However, at one point I pull out the needle, block the front orifice to have the Windex "bubble" into the cup. After that I spray the cup contents normally without the needle in position, oh, and wipe the needle while its removed.

Cheers,
Jan

I just bought the refill, just missing a few pieces but works just as well.

https://www.amazon.ca/Iwata-Airbrush-Cleaning-Refill-Pack/dp/B00OTTL0E8/ref=sr_1_12?ie=UTF8&qid=1508534608&sr=8-12&keywords=iwata+airbrush+cleaning+kit

I was looking at that other primer today, still undecided.

I bought an ultra sonic cleaner and every so often I fill it with windex and run the parts through for 2 minutes. occasionally I get surprised by the junk that comes out.

There must be a reason Iwata does not chrome the interior of the cup like they do the exterior but I can't figure it out.

When I bought my Iwata the dealer told me to never clean with Windex, or any other ammonia-based cleaner. I suspect that was just a marketing ploy because he wanted to sell the Iwata Medea cleaner -about $10/liter. Switched back to Windex with no ill effects. I just don't soak it overnight.

I've been cleaning mine with acetone for years with no problems.

One thing I have not seen mentioned, and it is a really big consideration with airbrushes and the paints and such we use, is the size of the needle and aperture that we use.

Paints and Primers, do not clearly mark the size of the particles that they have, look at the Stynyirez primer and you will see that they recommend a .5 needle or larger, thinning will not make that smaller, from what I understand, as the particles are .5 and may not pass through a smaller needle, this will clog the brush and give you really bad spray patterns.

i shot the Stynyirez primer and the Ammo "One Shot Primer" (same stuff different bottle) with my Badger 105 Patriot with the 0.3 needle at 25-30 PSI,no clogs,perfect flow and no spitting problem...nothing,works beautyfully

But is true,thinning will not make the pigments smaller