Any solvent, carb cleaner or even brake cleaner.
Anything special about the cap, may be about the same price to just replace it. Maybe find a chrome one , if your into chrome.
I used to pour kerosene through it and put the kerosene back in my parents hurricane lamp. Now I use whatever cleaner solvent I have laying around like carb cleaner or turpentine or something. But I still do it outside, not in the house.
I've had the same problem with getting on for my 1960 223. I gave up trying to buy one by the year and engine size. I just take mine in and match it up with the one that fits and is the same. Last one I cleaned had nothing left in it. :deadhorse:
I used to pour kerosene through it and put the kerosene back in my parents hurricane lamp. Now I use whatever cleaner solvent I have laying around like carb cleaner or turpentine or something. But I still do it outside, not in the house.
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