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There is a little dab of silicon on the locking ring to keep it secure in transport, but it offers no real resistance, just scrape it off. Spin that locking ring off and the blue disc can be tipped out of its holder.
CLR is the only stuff that will dissolve that gunk. Place it in a glass of undiluted CLR, leave it for 15 mins then rub it off gently with a paper towel. Rinse and repeat until you are happy it's all gone.
If you have some latex gloves, use them when putting it back in the holder - it's a little bit fiddly and easy to get a fingerprint on the disk! I didn't both re-siliconing the locking ring on mine.
Easy as that.
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