MOTM

I've just assembled a 440 kit and I'm now assembling a 410 kit.
Question: Should I use organic solder with polystyrene caps and 
obviously wash the board?
In the 440 manual it seems these must be soldered in after the last 
wash using no clean solder while in the 410 manual it seems they are 
soldered with organic solder and board has to be washed afterwards. 
Which of the two versions is the correct one? Many thanks.
Enrico Dibennardo (Italy)