You're correct. Identifying interference is half the battle. Sounds like you're speaking from experience. You have a few options to overcome interference. Lets outline a few:
1 - Move your access point channel away from the interference. In my example, microwave impacts channels 6 - 11, move your access point to channel 1 avoiding the impacted frequencies.
2 - 802.11b/g/n protocols use the 2.4 GHz spectrum. By standard they require 22 MHz spacing. Only 3 non-overlapping channels exist (1,6,11). Consider a move to the 5 GHz spectrum, 802.11a/n/ac where you have 20+ non-overlapping channels. This is your best option.
3 - Areas of low level interference can be overcome by increasing your transmit power, speaking louder than the interfence. Not always recommended, but something you can consider if you're out of options.
4 - Going to the source of the interference and speaking to the owner to work out a compromise. Not always an option, but something that could be considered.
Thank you for response!