Whats the best cleaner to use when cleaning the evaporator coil on a 3 1/2 ton rheem gas pack. Also have a toe kick vent in the kitchen which is next to dishwasher. Noticed moisture on floor in crawel space by this vent would it be wise to block off. Have another vent in kitchen which will take care of heating and cooling. Heat from dishwasher may be mixing with cool air from vent while ac is on causing this.