How can I use GIMP to effectively remove glare from a photo?

To effectively remove glare from a photo using GIMP, you can use the "Heal" tool or the "Clone" tool to carefully blend and cover the glare area with surrounding pixels. Adjust the brush size and opacity for precise editing, and use the "Clone" tool to sample a similar area without glare to replace the affected area. Experiment with different techniques and tools to achieve the desired result.