What's the best way to remove mortar stains on brickwork after repointing? It is now 5 months since this repointing was done. I asked the builder about this after a month and was told it was from the old raked out mortar and it would 'weather off' after a couple of months. Would a pressure washer do the job? Here's how it looks - View media item 61464 View media item 61465 View media item 61467