White bricks
This is really just a quick hack that does not fix a long-term problem. The problem is that you do not want to look at old bricks anymore and you want to source things up a little bit with a can of white paint. Well, that will not fix the issue and is a cheap way to restore old brick.
We would argue that it is worth just investing a bit more money and restoring the brick properly, it will save you more money over the long run. This is better for your wallet and the quality of the brick and overall structure. Remember that sometimes you just have to spend to save.