About 5 years ago i had a patio laid the marshall slabs the patio is laid like staggerd the problem is at the time when pointing i brushed in a dry mix yep and most of it has broken up and come out so im gonna put in a wet mix the question is there is still quiet a bit of mortar i have tried chipping it away but it's gonna take an age any ideas also putiing a wet mix back in i was talking to someone who lays patios and he recommended putting a very wet mix into a childs watering can ( for easier control ) filling the joints the hosing down with the sprinkler on to wash the flags but not disturb the joints .......thanks will