I just ordered this. Even the cleaner claims to be "made from ultrapure water, clean sensors without leaving streaks or blemishes" so it might be safe to use that on platters. I know I've heard of some people using purified water as a platter cleaner in the past.
I've got a few dirty platters laying around that I use to play with and I think that this swab has some potential, but I'm not so sure about the cleaner that comes with it...perhaps if used very sparingly, but it does not evaporate quickly.
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