Hi Red
M/S over detergents, as far as end results are concerned, is an argument too far.... I beleive that you can acheive good results with both and that there is little or no difference if done properly. But then you have the argument of residue with detergents and crysalisation with M/S which I'm not getting into.
M/S will make the job easier. presray, agitate, extract with fresh water - nothing simpler.
Regarding the extracta excell for agitation, I don't now this bit of kit, some of the old timers, i'm sure, will correct me if i'm wrong

but if it agitates, it will work.
Chris