This is one of the most infuriating and hard-to-solve issues. No matter how often or how enthusiastically you play, there will be parts of your guitar that gather dust like the corner behind your wardrobe that the hoover cant quite reach. Most of the time this will be on the pickguard at the bridge, and it doesnt even matter how many times you tug a cloth under the strings: that dust will is stubborn and will mock you every time you see it. One tip if you do suffer from this: hoover it. Seriously, the brush head for the hoover will sort you right out (at least until the next day when it's suddenly and inexplicably filthy once again).
