Grout softening is the process of making hardened grout more pliable and easier to remove. This can be done for a variety of reasons, such as when replacing old or damaged tiles, or when repairing leaks or other plumbing issues. There are a number of different methods for softening grout, depending on the type of grout and the severity of the hardening.
One common method is to use a commercial grout remover. These products are typically acidic and work by breaking down the bonds between the grout particles. Another method is to use a vinegar solution. Vinegar is a mild acid that can also help to soften grout. To use vinegar, simply mix equal parts vinegar and water in a spray bottle and apply it to the grout. Allow the solution to sit for several minutes before scrubbing the grout with a brush.