Banana Joe. 10• or less, visable moisture and / or wet runway would just be icing, and probes go during the after-start flow. It’s only when it’s 3• or less (with a wet runway etc) that it becomes defined as freezing and the probes go on before start (and we cycle the flaps fully before setting and do the run-up.)
At least in our books!
EDIT: Our manuals aren’t that clear either, and although I know it’s 3• (because we did it yesterday with a Line Training Captain) I can find the procedure but I can’t find the actual reference for the Freezing Conditions definition! Probably there somewhere, probably time to put it down and watch some rubbish on TV.