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.




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