I find Dettox Mould and Mildew Remover excellent for showers/baths/grouting. It is scary stuff (wear rubber gloves) but IME much better than plain bleach.
Try making a paste of biological washing powder and rubbing it into the banana stain. Felt tip is virtually impossible to remove but you could try the paste.
Give away 25 tins of the tomatoes (church? homeless shelter? elderly care housing?) and use the rest for spag bol.
And can you afford your cleaner for an hour or two more a week?