Most companies start their path by performing '5S' training or organizational or beautification events because an important customer is coming. Doing so is often followed by a failure to maintain and the reason for this is simple, 5S is not a tool but a philosophy that is based in understanding when something is not working as expected. For example, can you walk up to a machine and within 10 seconds learn how well your machine is performing? If not, you probably have chased 5S as a 'tool' instead of a 'way'.
The danger of Gemba is believing that the goal is catching people doing a bad job. This tool is not about people, it is about the process and if there are people involved in the process - can they follow the process. If they are not following the process then something is wrong with the process, which leads to Kaizen