I have used, soap & water, vinegar water, and when It has been really, really dirty I've used bleach water. just make sure you rinse very well when using anything but plain water. Also when I have used bleach water I rinse well then let it air dry with it open for a few days to a week before storing it for next time use. I just have two hovabators they are Styrofoam incubators. The bottom and the wire on the bottom, I submerge all the way but the top with the heating elements and fans I just wipe down.
I think there are some commercially available cleaning solutions out there too but I don't know what is in them. I think my incubator instructions say to clean with warm water only. Does your incubator have an instructional manual. It may give you the best info for your type of incubator, Sorry, I haven't heard of a bronzes incubator.