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Gently pick it up with a knife and tear it off. Be careful not to scratch the toilet bowl with a knife.
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Scrape gently with a knife. It can be easily cleaned up. Or buy a dissolved solution to clean it up (this is not necessary).
If it is dry, you can start from the edge and then uncover it, if it is not dry, use toilet paper first, and then use a clean thick towel.
It is best to use it after 24 hours of drying.
The correct way is to lay a good horizontal line first, and leave the part on the gypsum board within 5cm. The black mirror is glued with glass glue.
Glass glue can be used, but it must be done without water, and the tank valve should be closed for at least 24 hours after the glass glue is applied.
Generally, 24 hours is fine, and it is better to have a longer time.