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Default Cleaning off old motar from brick

followup...

I found out that old mortar is loosed by rain (water). Spent two
unpleasent weekends chipping away and scraping off moter. Then it
rained and the remaining bricks got soaked. The bricks are clay which
doesn't absorb water but the mortar absorbs soaks it up. The mortar
crumbles off.
Weekend 1 (2 days)-60 bricks
Weekend 2 (2 days)-40 bricks
Last saturday-120 bricks (after the rain)

Also,a sharp wood chisel was useful to clean the brick (had to sharpen
it several times), but it was useful to get under the mortar.