Hi Bill,
I am pretty sure that the L&R rinses are designed not to leave any residue but I wouldnt stake my life on it. I know when the clock parts came out they were dried in “gritter cob” a drying medium made form corn cob which is very absorbent and would leave everything very clean. Of course you cant use this stuff on watches, this is where your drying box would come in but I would be interested to know if there is any form of residue left.
I know what you are saying about wanting it to be as clean as possible, I think I held my breath the whole time I put my waltham pocket watch back together 
