Marinade sauce bottle left open for longer than recommended - safe to use?
If it says keep refrigerated and you didn't, I wouldn't chance it. A lot of things need refrigerator temperatures to prevent nasty things from growing and keep them safe. There are also some things that are actually safe unrefrigerated but retain quality better when refrigerated, and will say "keep refrigerated" on the bottle, but you don't really know which is the case here.