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I believe the 951 is for electronics but I’m not entirely sure, but yes I will scratch that one off my list anyhow.

According to Kester’s description (951): “suitable for automotive, computer, telecommunications”

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There seems to be quite a difference between 186 and 959T because of the rosin content, what I’m beginning to understand is that it’s the rosin that needs cleaning, the 186 has more rosin because it’s for uses where better fluxing is critical, but still needs the classification of RMA, so I think it has the most rosin possible and still remain under that classification.

The 959T has less rosin and is said to result in the most “shiniest solder joints”

So now I’m thinking the 959T would be ideal for drivers and mcpcbs and the 186 better for tasks that may require better fluxing, such as soldering large brass/copper parts, pills, torch soldering etc.