Not a permanent solution, but have you tried HG Mould Spray?
It really does shift mould. If it doesn't come off immediately, leave some on the surface for half an hour or an hour, and you'll be surprised how much comes off.
Ever since having it refitted, we use a squeegee and a microfibre flannel to wipe down and get the shower screen and the edges of the bath dry.
Yes it is a chore and takes a minute or two each time you shower, but the bathroom has been fitted for almost 5 years now and the sealant looks as good as new. I believe this is the only real permanent solution.
The other thing we do is put away all shower gel and shampoo bottles in a cupboard as leaving them on the edge of the bath tends to trap water and lead to mould.
Well ... I resealed all the bathrooms the other day, the only change I made was to bleach the seams after I took the seal off. I hope that will delay the onset of mould.
I have some lodgers here so they are not responsible enough to clean up after themselves. Unfortunately !
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