Although there is no obvious leakage, I suspect that there could be some condensation. I have considered placing drywall (plasterboard) over the existing ceiling in order to solve this problem. I have also considered using Blueboard and Greenboard, but I understand that these would be more involved and expensive.
Should I also consider placing a vapor barrier in between the existing ceiling and drywall? What are your thoughts?
The space between the bathroom floors and dining room ceiling is quite cold, and I think any moisture can condense, not showing actual leaks but wetting the metal lath and plaster underneath, as indicated by small stains which you have treated. Your ideas may work, but I think it is best to have cellulose or fiberglass blown into that space quite compactly, keeping it warm enough to prevent condensation. Or, cut a few small vents in the ceiling, allowing house air to enter that space, perhaps, preventing condensation.
I let a scarf get too close to the glass of my gas fireplace insert. The material burned on the glass. Do you have any cleaning suggestions? I have tried warm water and glass cleaner for stove, grill, and hearth suggested by the company where we purchased the gas insert.
If the burned area does not feel rough, try Easy-Off or foaming oven cleaner. If that doesn’t work, try TSP solution, or paint thinner (slow). If the area feels rough to the touch, try scraping carefully with a razor-blade scraper, or rubbing with Mr. Clean Magic Eraser.