remooble chalkboard renew works miracles on tough chalkboard stains that just won't erase. Our cleaner is the only chalkboard cleaner that has the AP seal certifying that it is non-toxic and safe for schools and kids, yet is powerful enough to remove the toughest marks and stains. Other cleaners claim they are non-toxic, but their bottles include bold warning labels telling you to keep their product out of the reach of children. Despite the harmful chemicals, their products still can't get the job done. remooble chalkboard renew easily cleans dry erase marker and liquid chalk from chalkboards, whiteboards, glassboards, and other dry erase surfaces. But where we really shine is when the job gets tough. Quickly wipe away ghosting and shadowing stains, permanent marker, or left-over adhesives from post-it notes or tape. No waiting – simply spray and wipe away.