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Hi Grahame,
Just a question...have you observed when your neighbours are have a BBQ and you can smell the snags and stuff cooking away?...or....a place where road traffic is frequent and jet aircraft fly overhead?...the reason I ask this is because of the oils, sticky smoke and burnt jet fuel that are present in the air when you observe and of course find their way to the mirror's surface..
When you try to wash it off it will sometimes smear and swirl over the mirror....(like I found out the first time I tried)...it's like a greasy window...cold water and detergent will find it hard to clean.
The method I use is to place the mirror in a sink or basin that has been throughly cleaned and sterilized with metho including the sink plug!! (use gloved hands A/C the oils from your skin) filled with warm water then gradually add hot water until the temperature is around the 40 c...next add a mixture of detergent (4 drops of detergent to a cup of water and mix) to the hot water over the mirror and allow to soak for 10 minutes. Drain the basin and rinse the mirror with warm tap water followed by distilled water....clean, sterilize the basin and repeat the process but after soaking for 5 minutes swirl the mirror around the basin for a few minutes before rinsing and remove any drops of distilled water with the corner of a rolled-up tissue...whatever gunk is left behind shouldn't affect your image!!
I know it sounds excessive and it may not remove all of the greasy deposits.
I hope this helps...cheers!
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