What a clean sound is can be very arbitrary, depending on who you ask. Also, it's impossible to give settings for just any setup. I can play a Strat through a 1967 Twin Reverb with all knobs at 10 and it's STILL clean....my ears are bleeding, but it's a clean tone. Alternately, if I put my little Pro Jr volume on 3, it's already a dirty sound.
What kind of guitars, amps are you using? Generally, a clean sound just has no distortion, generally low gain settings, using clean channels on amps that have them.
Generally.
H2H