[simne]

For example, once my buddy worked with large batch of mobiles, and he bought new Flux, claimed "not need to rinse off".

So he made manipulations, and try to turn on - 1,2,..,5,..9.. Well, whole batch not worked. Imagine, his feelings!

He asked professional, answer was: "you don't need to use chemical additives to rinse off, but you must use just clear water, then sure dry board". And it really helped.