Jouk, can't you put the jets inside the brush? The arcing up of the water above the jets is going to bring down dirt from the frames or brickwork.
Peter
yes its possible, you can trimm down the front if it slops up, then fit it in the hole, or just simply move the nozzles by pin a bit lower, they are ajustable ball nozzles, thats what is great about them, peter i have only field tested them, for about 2 hours, the water will only go where you put the brush, they are very accurate, thinking about it,
i had a look at the nozzles, and theres plenty more room to move them downwards, if the need arises