We have seen the damage that chemicals such as bleach and vinegar do to an air conditioning coil. For the life of your AC, do not pour any chemicals down your drain line. Only use warm tap water and use a wet-dry shop vac to suck out any slime or sludge that may be in your drain line from the outside drain. We do this for you when you schedule an annual or semi-annual check out and when you call us saying water is flooding out of your ac. Call Brown’s Arctic Air to schedule your annual check out service 352-728-4990.