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Thanks for your replies Dunk and Richard.
The gunk is coming off using the 50 / 50 mix. It's just taking a bit longer than I thought. I might up the strength a bit and see how it goes.
That TV site I saw for the first time when I was checking I had everything right with the IPA. That was encouraging.
I haven't seen evidence of staining yet but stopped to check what people here thought and it was getting late.
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