How do you unblock the hose leading from the soap dispenser?

The machine started leaking from the front of the soap dispenser during filling. I removed the tray and there is standing water. I have tried to poke down the hose with a cable tie but it seems to be blocked. I added some Domestos pipe unblocker liquid suitable for unblocking pipes with standing water. It made no difference despite all the promises on the bottle! Can anyone advise me how I can unblock this pipe please? Jill