How to repair the crack in the window?

Use special sealant tape.

1, the sealing strip is ready.

2. Measure the gap size of the window, and cut the sealing strip into appropriate width.

3. Wipe the internal dimensions of the window clean and set the length of the sealing strip.

4. Remove the cut tape.

5. The sealing strip should be attached to the junction of two windows and the wall, and the upper right corner should be pasted tightly.