Grease/Dirt on ports - Stuck at cleaning
Recently I bought this used Macbook from Ebay and I have stumbled on some minor detail problems, the dirty ports. There appears to be this black kind of grease on some of the ports which I am unable to get rid of. Basically I don't think I have the right equipment.
The things I have tried to use is a Q-tip/Cotton swab and distilled water. At first, I did manage to clean some of the gunk off, however, because the cotton swab is pretty 'large', I couldn't continue and I have a feeling that with continueing using the cotton swabs, there's gonna be these small cotton leftovers which if I'm correct, could cause for some damage. So in other words, I'm pretty much stuck at the moment.
I do know that many people suggest Isopropanol, but I don't have this at the moment, so I'm gonna continue using distilled water as it's currently the only alternative I have (if it's alright of course). So what my actual question to all this is, what item would be the best to clean this kind of dirt of these ports without damaging the electronical parts.
EDIT: Forgot to mention that for me at this current moment, it's hard to get Isopropanol.
Pictures for reference:
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