Rinse Out the Pieces in Hot Water
As resin builds up in the crevices of your bong, it would be best to loosen it out first. This could be achieved by submerging the glass bong into boiling water. Let the water do its trick by softening everything that might be clogging up your bong. If you could produce the boiling water to become scalding hot, do it.
But be careful about this one. Any type of glass would shatter upon contact with hot water especially if the glass has a cooler temperature compared to the water. To avoid this, you can soak the glass bong in the water before it boils. In that way, the temperature of the glass bong matches with the water before it becomes too hot. But for those doing routine cleaning, rinsing the bong under running water would be good enough for now.