with a snap-off craft knife with the blade extended cut flat to the wall & flat to the bath rim (take care not to scratch the bath) then peel the silicone away
or
use silicone remover - it's in spray form - make the job easy
How to prevent it happening again: use a good quality sanitary silicone and rinse/wipe off the sealant at the end of each bath session. Red staining can often be caused by pigments in shampoo and other juices used at bath/shower time ... so rinse them away.
Have you ever used it? It doesn't work as you say. You can use it if you remove the majority of the silicone and use it to remove the small bits that are left, but it won't work by just applying it and waiting for it to lift/soften the silicone bead.
If you say so.
Personally, I don't think there's any need for the stuff - any small amounts remaining can either be rubbed away or removed with a sharp wood chisel.
Always dry the tiles and silicone areas with a towel. I do with my bathroom and after 9 years it is still as white as the first day. I also tell my customers this but some moan after a few years about the colour of the areas and I know they have not done as I surgest.
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