Cut away most of the silicone with a knife/razor blade/silicone removal tool (and pull) and wash away the last of it with vinegar or another silicone removal liquid. For example:
https://www.bauhaus.se/silikonborttagare-tebo-softgrip
https://www.clasohlson.com/se/Silikonborttagare-Pattex/p/31-9174
https://www.bauhaus.se/silikonborttagare-tebo-softgrip
https://www.clasohlson.com/se/Silikonborttagare-Pattex/p/31-9174
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