Others mentioned smell, I wondered about the taste ;)
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I use the Castrol stuff. (it's red)
Hard to find, but it's the best I've found at removing bugs and crap in general, but I haven't used (or seen ?) the Sonax stuff, so I'll keep an eye out for it.
I just dumped some Windex in mine last time I filled the res, you really need ammonia to remove bugs properly although it's not the best for paintwork, I like to be able to see....
Straight water just doesn't cut it, all that happens is the bugs get smeared everywhere making an unholy mess.
Firm believer in RainX. Usually purchase a bottle and add it to a 20l drum of rain water (The Holden Ute's windshield washers were inspired by a firefighting hose, it goes through heaps), about half the recommended strength but I find it works well.
Rain-Ex. :BigThumb:
Treated screen with it.