Ive cleaned some really nasty car evaporators with viper foaming coil cleaner in aerosol form, it gets in there and pushes out the junk - you will then need to flow some water to get everything out and through the drain tubes.

for condensers - you can use it again or just use any degreaser gently.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)