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Never heard of that before. One of these?
https://www.screwfix.com/p/erbauer-adhesive-lacquer-sealants-scraping-blade-52mm/2497p
Hovis-
I've never used the erbauer one but it does say it cuts sealants. The fein one is £7 odd from Axminster and looks like you would have to misuse it to need more than one in a diy lifetime.
https://www.axminster.co.uk/fein-flexible-scraper-starlock-508756
Of course that's star lock which my current machine doesn't have so I guess that's a reason to have to buy a new one!
As noted though, just don't go crazy and scratch everything to pieces. If you need to do it on a ghetto budget then use a Stanley blade with some duct tape on the back. That is painful though in comparison with the multitool.
Airhead
I've used the type that Aggi has listed, for the little money they cost they are well worth having in your toolbox, wouldn't recommend it for that job though, it's amazing at enlarging the holes for downlighters.
The best method I've come across so far for silicone removal is a multitool (Fein or similar) with a thin slightly flexible blade from Fein (not the long one), it's designed for the job and it does it so much faster it's not even close to any other method.
Then clean up any residue either with Soudal silicone remover or CT1 multisolve (or both). I've never used WD40 just because it's oily and smells wrong in the bathroom!
You might scratch a plastic bath or shower so either be careful or have some cutting compound standing by and polish the scratches out.