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Thank you, neilm.Absolutely incredible work. Just spent 3hours going through your build.
You can use Citric Acid for this job too, available as inexpensive dry powder in many places. Non-toxic and as green as it gets. If modelling gives you lemons, you can make lemonade too.Note that before applying the product you must very well degrease the brass parts with alcohol or / and acetone. If parts were soldered, they must be totally cleaned from any flux. Flux removal can be done with acids. I use this:
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