I use the razor blade, actually a box cutter blade, to scrape off that thick, crusty, bubbly, type of creosote. We're not talking about an amber film here guys and probably not talking about anything remotely tarlike but more like hard bedliner material such as Line-X. The heavy dry accumulation does not cover the whole window so a combination of standard glass cleaning techniques (ash and paper, chemicals, rutland paste) plus the blade gets it clean.
The real heavy stuff is so dry that the razor blade shoots off black crystally powder as it works. Remember, the stove glass is not glass, it is clear ceramic. Supposedly quite resistant to this type of abuse.
The real heavy stuff is so dry that the razor blade shoots off black crystally powder as it works. Remember, the stove glass is not glass, it is clear ceramic. Supposedly quite resistant to this type of abuse.