Buy yourself a vacuum system and sleep easy!
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And.....you've got a bigger problem than goopy tissue.Tissue makes a goopy mess.
Makeup removers work well too....little foam pads. Depends on whether you'd rather be seen in a gun store or at a makeup counter.Others have given you good advice, but I will add my "2 cents worth".
When you are cleaning the groove that the o-ring sits in, do not use a "Q Tip"! Use something that is lint free. Things that I would recommend would include a corner of a micro fiber towel or make a trip to your local gun shop and pick up some lint free cleaning swabs (They look like Q Tips but at lint free). You don't want to leave any fibers behind when you clean the groove.