[davidmanze]

Alright, if you already dissolving the Canadian Balm, you can as well polish the rear element (tooth paste should do, but no whiteners...) and but the multicoating back by heating some crystals in a frying pan and put the lens in that steam. Vacuum is overrated anyway

 

Just kidding..
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Actually steam is not a bad idea, I'll have a cup of tea and a couplet for breakfast with a bit of ketchup for the coatings!!