What should be done if ice is still present after initial de-icing?

When ice is still present after the initial de-icing process, conducting a second de-icing cycle is the most effective response. The primary goal of de-icing is to remove existing ice from surfaces to improve safety and functionality, especially in aviation and transportation contexts. If ice remains, it could compromise performance and safety, making a second application necessary to ensure that all ice has been effectively removed.

The second de-icing cycle often involves the application of a de-icing fluid that can melt any residual ice and ensure the surface is clear before usage. This fluid works by lowering the freezing point of water and allowing for better removal of ice.

While waiting for warmer weather could potentially help melt the ice eventually, it is not a reliable or immediate solution. Anti-icing fluids are designed to prevent ice formation rather than removing existing ice, so applying them in this scenario would not effectively address the problem at hand. Similarly, using a heat source to melt the ice isn't advisable due to complications that might arise, such as damaging the surface or failing to effectively remove all ice. Thus, a second de-icing cycle is the most logical and effective measure to take.