Posted by Michael Gilligan on 11/10/2015 11:04:44:
I have found that one of the best washes for this, and any other optics, is a weak solution of "alberto balsam, tea tree tingle" Hair Shampoo …
Thanks for the tip – I picked up a bottle of this on a recent supermarket run. Initial results are promising.
I recall upsetting the optician by mentioning using washing up liquid for this and imagine that modern dish washer chemicals would be even more exciting.