@gs960 , I'm not sure how you would squeeze your bladder, apart from exerting muscle control? There are bladder stimulators available, which you press onto your bladder :- https://www.eric.org.uk/Shop/malem-bladder-stimulator This is just an example. I'm sure there are other versions available. Have you had a chat with Continence Services? Your MS Nurse should be able to put you in contact with them. You might be able to try out a Bladder Stimulator, before you spend any money.

@gs960 my physio advised me to lean forward, pressing on my stomach to try and empty my bladder completely. It does work - sometimes I get quite a lot more wee out, sometimes just a trickle, frequently nothing but I don't usually have to wee again for a few hours. I'm female, so sitting down doing this. I can't see why it would be different for a man.