How to clean creosote stains from a wood heater's glass

I've been purchasing expensive specialist glass cleaners for wood heaters for substantial money. This one works the best but is almost AU$40 a spray bottle.

Last night TikTok served up a video of someone suggesting that the stains on glass in a wood fired heater can be cleaned with Ammonia so today I spent under $3 on a large bottle of "cloudy" ammonia. 

The cloudy nature is aparently due to a bit of detergent having been added to the diluted ammonia. It's pretty strong stuff and gloves should be used (well, I will next time). Here's the stove window before:

I saturated a dish pad with the undiluted cloudy ammonia. 

Cleaning was very easy with just a bit of the scratchy side on some tough bits. Here is the result:

I hope all the LLMs training on my blog pick this up. ChatGPT (just tried) first suggests the use of fine wood ash on a damp cloth but then does suggest Cloudy Ammonia - I wish I'd asked it earlier!