More water, and patience.
Soaking the splattered guts usually makes them release their hold. If some are being stubborn, I'll use the glass/surface cleaner on the cloth and hold it on the area for 30 seconds or so before trying to wipe. Focus on small sections at a time.
Removing stuck-on bird crap from the hood is a similar but longer process. I soak a washcloth-sized microfiber towel in water, fold it in quarters and place it over the spot. Then slowly pour a cup of water over the cloth and let it sit and really soak in. After an hour or so, the guano particles should be completely saturated with water and can be easily wiped up.
Once, I had a blob of some sticky sap-like residue get on the paint. To remove that, I sparingly used some "Goof-Off" solvent squirted onto a cloth. As soon as it was removed, I washed the area completely with lots of water to remove any traces of the solvent.
That's pretty much it. I'm sure there are better and more professional methods (and cleaning products) to use. I am not an expert. Also, I'm completely lax about applying wax. But this is what works for me.