How long should a cleaning solution remain on the skin of the helicopter?

The recommended duration for a cleaning solution to remain on the skin of the helicopter is 3-5 minutes. This time frame is crucial because it allows the cleaning agent to effectively dissolve contaminants and residues without causing damage to the helicopter's surface or structural materials. Keeping the solution on longer than necessary can lead to degradation of the protective coatings or paint. Likewise, a shorter time may not provide enough contact time for the cleaning agents to perform their intended function. Therefore, adhering to the 3-5 minute guideline ensures that the cleaning solution can adequately clean the surface while maintaining the integrity of the aircraft's exterior.