u/Queasy-Card-1792

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Got a load of yellow imperials from Selco and left a few in the rain when I was setting out. A couple of days go by and then this happens. I think it's called eflu-something but it feels like theres loads of salt in the bricks thats coming to the surface the moment they get wet?

Is this just something I have to live with and try cleaning off later, or can I soak the bricks in water first or something to avoid my wall looking shite the moment it starts raining!

Why would anyone manufacture a brick that does this in the first place...