Ideally you drain window units every couple of weeks, when you clean the filters. Once a year a deeper cleaning is a good idea. One where you take the cover off, clean all the built up gunk out, and then let it dry. You can use a cleaning spray specific for air conditioners, or even just water for a significant improvement.
I typically use the cheapest “no rinse” cleaning spray for air conditioners that Home Depot sells, a toothbrush, and lots of water before/after. It really extends the life of the unit, preventing the build up of mold and improving the units efficiency.
Ideally you drain window units every couple of weeks, when you clean the filters. Once a year a deeper cleaning is a good idea. One where you take the cover off, clean all the built up gunk out, and then let it dry. You can use a cleaning spray specific for air conditioners, or even just water for a significant improvement.
I typically use the cheapest “no rinse” cleaning spray for air conditioners that Home Depot sells, a toothbrush, and lots of water before/after. It really extends the life of the unit, preventing the build up of mold and improving the units efficiency.