He probably can't do silicone is my guess sand and cement is old hat nowadays, silicone is just about the strongest most weather resistant render you could have done and you can choose a colour so don't have to paint it ever
It doesn't need to come down at all you'll just destroy the blocks trying to get it off, what's on will still be solid even though it's been done wrong. My advice would be to re bead and base with mesh, you could even secondary fix with some plugs if it makes you feel better then top with...
You can go over it don't know why everyone is so obsessed with knocking them off you might need to knock the beads off around the windows if there isn't enough room on the frame to allow another bead over the top
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