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I use it (Isocol) on a semi-regular basis. If you've got nothing else to use it will do. It does leave a tiny little bit of a residue but if you rinse thoroughly you should be rid of most of it. But do dilute it first - rough amounts, at least by half but even a 1:5 dilution will work ok.
Don't know about the grab-its. Should be ok for the tube or other outside bits but wouldn't try it on any optics. It would pick up the gritty stuff and then you'd drag it across and scratch your optics.
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