My neighbor worked for Gallo winery and said they used wine to clean the cement floor daily. I have heard that Thunderbird wine it is good for garage floors also with grease spills. I haven't tried it but what have you got to lose?
What about contacting the old owner. Maybe he would like it back or a neighbor that knew him would like to have it.
Let it sit long enough and it will turn to vinegar, it may be already. It can be used as a household cleaner where ever vinegar would be used normally, one caution, if it's red, don't use it where it will stain.C
If it is white wine it is great for getting red wine, grape juice, etc out of carpets...just pour it on and the stains disappear