You should have a nice amount of paste and black soot on your towel.
How to clean soot off fireplace glass doors.
You can clean a fireplace glass with vinegar straight from the sprayer or dab it on with a clean towel.
Repeat several times or until the soot is lifted.
There is no need to dilute the mixture and it works to shine the glass as you clear the dust and debris from the surface.
Cleaning the glass fireplace doors is a regular chore in the winter but luckily i ve picked up a trick to quickly and painlessly remove that baked on soot from the glass.
Make sure that you get into the corners using a cotton swab if necessary.
Cleaning your fireplace glass outside or in the garage is also a good option.
Finish off with a regular glass cleaner and paper towel to leave a streak free glass as good as new.
Undiluted vinegar is an easy nontoxic first response to clearing cloudiness from the fireplace glass.
When we first moved here i scrubbed the glass with windex and a chore boy scrubbing cloth love those things.
Take a damp paper towel or newspaper and dip in leftover ashes.