There are two problems with this method. First, even on a building only a few years old, the sanded surface always looks cleaner than the surrounding surface. Second, it's impossible to completely lift the paint from rough or porous surfaces. Even after sandblasting, the paint may still be visible. Abrasive cleaner .
Abrasives come in powder form and are a mixture of baking soda or pumice.
In a kind of liquid form of sandblasting, the abrasive is mixed with water and applied with a high-pressure sprayer. This method is especially effective on a metal surface. It's also a slow process. Often, it's better to call in a local cleaning firm. Chemical solvents .