terumo

"Mr Mckenic" is a type of spray to dislodge the dirt out from the coil. Normal house drainage pipe only 13/16mm . Imagine the amount of dirt going into the pipe within a short period of time, it will cause yr pipe to get choke faster. Diy, you can try to pour warm water into the aircon drain pan and let the warm water slowly flush away the dirt .

U got yr quote for the Daikin system?

Daikin have system 4 non-invertor using R22 gas. 3 x 9k btu fancoil for bedrooms and 1 x 18k fancoil for living room. Great for 4 rooms flats with limitations on 1 compressor.

Vrv system is expensive to setup and repair. Maintenance is smilar to normal units.

Thery use vaccum cleaner, but must be wet/dry vaccum cleaner. normal cleaner can only vacuum dust not water.

Vaccum and standard charge of gas i tink even if you call the "agent: means yr air con brand tech to do, think around $150. Yr $260 is slightly over priced.