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If the old cartridge was put away with the nozzle still in place,
you may be able to undo the nozzle,
and pull the cured sealant plug out of the cartridge
allowing easy application of any 'fresh' sealant underneath.
Without the nozzle, moisture has probably found its way in and cured all the way down the cartridge.
mespilus
That time for replacing the shower sealant has come around again (as the mould is getting too visible), usually I'd tack it on to some other DIY jobs and get a handyperson in but Covid and other stuff means I should really have a go myself.
Removing old stuff. Any tips or is it just a case of removing as much as possible with whatever is to hand and applying a new strip over anything that remains?
Is a Mark 1 finger (in a latex glove) good enough for smoothing it or some other magic tool/trick necessary?
Other than it could be completely solid and useless, should the part used tube that's been sat in the cupboard for 2 years since it was last done be ok?