Someone recommended this product to keep my beautiful new woodburner's glass clean. This as particularly important as the stove is double-sided with 2 very large windows.
The product works just as well as advertised. You spray it on liberally at the top of the glass and the foamy liquid sort of slowly slithers down the window, cleaning as it goes. It clears most deposits in one pass - you simply wipe away the grime and foam with kitchen paper. Only the most stubborn marks require another application.
One word of personal advice. Try to use disposable gloves to do the job as the foam contains quite potent chemicals that leave your hands horribly slimy and which can't be easily washed away!
Oh, and another thing! Don't be tempted to shake the bottle before use. It aerates the liquid and makes it go all 'bubbly' so it can't be dispensed via the trigger spray.
Altogether an outstandingly effective product. Highly recommended.