There is a lot of efflorescence on the facade of the house, brick facing, straw color.
Tried "Prosept Cement Cleaner – Remover of efflorescence" mixed 1 to 2 with water – nothing, undiluted also had no effect. On the test wall was a solution of hydrochloric acid and hydrogen peroxide. The wall dried out and left a drip of drips. And tried primer on the facade, also the brick takes on a wet color and all in drips. Trying to wash them off is even worse, you get some stains on the brick.
Is it at all possible to remove this efflorescence? Maybe some kind of varnish can be applied on top?
There are many remedies for removing efflorescence on the market now. The more expensive ones really work.
Another radical method is hydrochloric acid, but you have to handle it very carefully. You should start with a 1:5 solution in water, gradually increasing the concentration.
We also have a straw-colored brick, the wall under the balcony soaked through with melting snow. In the spring, the water drainage problem was completely fixed, the wall dried out, and there was a horrible buildup. On a hot day, I washed it with Deoxyl-2, it dried quickly, and the effusion completely disappeared.
But some of the bricks either completely or partially changed color to a darker color. This is no longer from the flush, but from the fact that the brick was soaked. It's been 2 years, in dry times the bricks are all light, in wet times they are darker, but gradually the bricks are leveling out – burned out in the sun. When I was looking for a solution to the problem, I read that when the house will turn on the heating – all the efflorescence will pass – over the years, the brick burns in the sun and ages, good brick – beautifully aged, if you eliminate the water supply – and efflorescence itself will disappear.
Do nothing, in 2-3 years the plaque will completely disappear by itself.