A couple of tricks from industry guys, not Brand approved but proven at the bench: Uhu Patafix, the yellow one, is a decent Rodico substitute that doesn't leave visible residue. The white one doesn't work. You can't touch it with your fingers, only cots or the pegwood trick from above.
The other one is contact cement. When dealing with black polished steel parts, in a new watch, they have to be impeccably clean. The trick is to dip toothpicks in the contact cement, so just a little bulb is at the tip, and set aside to dry. When casing up, any small marks or bits of stuff that won't blow off can be picked up with the tacky cement (it stays tacky a long time). It won't leave a residue on the steel. The fellow who told me this one used the cheapest contact cement he could find, it was some offbrand stuff. I tried Continental tire glue for bicycles (the one for gluing on racing tires, not patching inner tubes) and it worked fine.