"ss" wrote in message
...
On 23/10/2019 11:04, John wrote:
My daughter's house has a rather nice walled garden - but the wall has no
capping and some of the bricks are spalling. The wall is a brick length
thick - with the top of the wall laid with bricks across it.

I really feel we need to put some capping on the top to prevent more
water
and frost damage.

What would you suggest? Glazed brick? Stone?

Could the wall be cleaned as it looks a bit stained from water soacking
down it?

Unless things have moved on it used to be an acid based cleaner was used
to clean brickwork,

Thats used to get the excess mortar off the face
off the bricks, not to clean water marks off them.

I dont know what it was called

Hydrochloric acid, also call muriatic acid.

or if still used today.

Yes it is.