How can I clean the window (inside) of a self cleaning oven?

I used regular oven cleaner on mine and used the directions for the whole oven.

Is it between the glass?

Usually, you have to remove the door from the oven, place it on a flat surface and either remove two screws on the lower narrow part of it to separate the inner and outer parts or there is an easy to remove inner door glass by sliding to the top. Check your oven's manual for instructions. There is always something on that.

Use a magic sponge on th cold glass and a razor

Or sprinkle baking soda on the glass and vinegar it will foam up let it soak for a little while then wipe off

Becareful of using the baking soda trick,i did that and now it is inside the glass of the oven door.

Thanks to all for their hints.

How about trying Bon Ami and Mr.Clean eraser.Make the bon Ami into a paste with water and leave it on long enough to cut the grease.

An orange based cleaner should help cut through whatever got "slopped" on the glass as well as a razor scraper.

This video will walk you through the process: https://www.youtube.com/watch?v=3XCmlDoSQfM

Here's a tutorial that might help https://chascrazycreations.com/how-to-clean-your-oven-window/