JoJo - You may not have much in your lines. Some do, particularly if they are several years old and a mix of dust, bugs, and mildew get in there. Or, your lines might just be very clean. If so, great. Mine doesn't flush out anything either. Your line will probably drain out by the compressor unit outside. There may be two or three white pvc drain pipes out there. One for the water heater leak pan, another for the water heater pressure relief valve, and the third for your A/C condensor drain. Just pour some in the port, then go out and see which one has water under it. The water heater drains shouldn't have any. BTW, if you have your furnace-A/C unit serviced by a professional, one of the things s/he will do is flush that very line with a cleaning solution.
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