WD 40 is for lossen rusty parts. Although the coil cleaner is alkaline base but advisable to rinse it after u see the dirt coming out from the fins , cos in long time condition , it might damages the coil. Of the condenser is brnad new, and u do regular cleaning with water will do. But if your unit is very dirty, coil cleaner is a must to clear the dirt in it and better put on a mask when u do the cleaner and prevent chemical pouring at your hands. Cos the chemical will "bike" your hand....
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