In the past I always drained caps using a simple analog voltage meter. Digital versions don't seem to work. Place it on a high ac setting and touch the probes to both sides of a capacitor. You can watch the needle dropping as the caps are being drained. Takes about 3-5 seconds.
The resistors within are doing the same draining function as the resistor-to-ground method mentioned earlier, and you also have visual proof the act is occurring. Of course, double-checking with a digital meter is always advised.
