Surin Founding Father
Don't worry about the glass doors @Coffee. Just don't clean them. Your dogs will soon leave some tell-tale signs, paw prints, doggy kisses, and muddy scratch marks etc.. I am reminded about when my mother in law paid a visit to our house. I made a special effort to clean the 4-panelled glass door with Windolene. It was a beautiful job, crystal clean and no scuff marks anywhere.
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Nearly cost me a new glass panelled door when the mother in law tried to walk straight through the closed door. Fortunately, the glass did not shatter although my mother in law's face looked a little puffed up.
You're welcome to come around here Nomad... we have lots of glass for you to practice your skills on!