Performed single system cooling maintenance on a 2022 mini split unit with 2 heads. I checked the system for cleanliness, washed the filters, washed outdoor unit, checked supply temperature, and checked the surge protector. The system is performing well, but could use a chemical cleaning on the outdoor unit. This is due to water not fully cleaning it as it appears to have a cottonwood substance in the fins. The head in the main potion of the house was spitting water out yesterday. After investigation, I determined it was due to the door being wide open on an extremely humid day and the filter being dirty.