using a pencil is simply the easiest. however it may not have long term effects, since many report that the effects wear off after a while. but since it's so easy to re-apply it's not that big a deal, also note that it doesn't void your warrenty.
conductive pens are harder to use, and since they're so bulgy and clumsy you're going to have to use something else to apply it, tip of a needle, a small bristled brush, etc. also note that conductive pens weren't designed for such tiny applications, and also cost money.
another alternative that's quite popular, more so then the conductive pens but less so then the pencil trick, is using the rear window defogger repair kits. those work very well if you're able to connect the traces, you need a steady hand and don't get too nervous about it. easily removable however, only prob is it's a little tricky to put on, and a kit costs $5-8 at a local Pep Boys, AutoZone, etc.
easiest way would be the pencil trick, it also has the smallest risk involved- nothing easier then erasing it. use a mechanical pencil too, the tip is much finer for such a job. most use the pencil, some want more security and use the loctite defogger kits, not as many use the pens.
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