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It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.

To stain brick, you should use a product specifically formulated for brick, concrete, or other masonry surfaces. These stains are designed to penetrate the porous surface of the brick and bond with it. This is different from paint, which sits on the surface and is prone to peeling, flaking, and trapping moisture that can cause damage. Water-based brick stains are often recommended because they are easy to apply, even for DIYers, and they allow the brick to breathe. Avoid using regular paint on brick, as it will not adhere properly and can lead to future maintenance problems.

Limewash can be removed from brick, but the method of removal will depend on how long the limewash has been on the brick. If the limewash has fully dried—which happens after about five days—you’ll need to use a diluted muriatic acid mixture to remove it. If there are multiple coats of limewash, you may need to apply the acid mixture several times to fully remove it from the brick.

Yes, it is usually possible to repair a damaged brick mailbox. A professional brick mason or masonry contractor can perform the repairs. They can assess the damage, provide an estimate, and help you determine if the repair is worthwhile based on the mailbox's value and the extent of the damage. The repair process may involve sourcing replacement bricks and mortar. Damaged bricks can be cut out and replaced, or the mortar joints can be cut out and retucked. It's important to note that the new mortar may differ in color from the original. If the mailbox insert itself is damaged, it can typically be cut out and replaced as well. If your brick mailbox has been completely destroyed, you should check with your local building code enforcement office before rebuilding, as some areas do not allow brick mailboxes due to the potential hazard they pose to drivers.