When it comes to cleaning grout, there are a few things to keep in mind. First, never use harsh chemicals or abrasives on grout, as this can damage it. Second, be sure to use a soft cloth or brush when cleaning grout, as anything else can also damage it. Finally, always rinse grout completely after cleaning it, as any residual cleaner can damage the grout over time.
With that said, cleaners can damage grout if they are not used properly. Always be sure to read the label on any cleaner before using it, and follow the directions carefully. If you have any doubts, it is always best to err on the side of caution and contact a professional for help.