Hi there, for some reason I have been collecting all my old coils and doing research on how to clean them as well as considering buying one of those cleaning machines. I've gone on YouTube.....tried all the tricks. The other day I decided to put all my old coils in a sock....then into another sock...put it into a bag...closed the bag up and washed it all on a cold cycle on my washing machine....the result....beautifully clean and sparkly coils that work like a charm . Thought I would pass this on, maybe its not new info...but had never heard of it.