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.
How to clean soot off fireplace glass doors.
Take a damp paper towel or newspaper and dip in leftover ashes.
You should have a nice amount of paste and black soot on your towel.
When we first moved here i scrubbed the glass with windex and a chore boy scrubbing cloth love those things.
Finish off with a regular glass cleaner and paper towel to leave a streak free glass as good as new.
Wipe the glass in a circular motion to loosen caked on soot.
Undiluted vinegar is an easy nontoxic first response to clearing cloudiness from the fireplace glass.
Repeat several times or until the soot is lifted.
One clever all natural way to clean your fireplace glass is to use a newspaper or paper towel and ash.
Cleaning your fireplace glass outside or in the garage is also a good option.
Make sure that you get into the corners using a cotton swab if necessary.