Whoa! As normal for a forum - lots of answers and suggestions.
Not to be a spoil sport or downplay anyone's feedback, but for each 'suggestion' could some 'supporting' info also be supplied. Sure wouldn't want the OP to try soap, wax, KY jelly or other stuff and then find he could not get a good glue joint and he also couldn't get the 'lube stuff' off either - that would not be good.
If it were me, I'd ask a pro - just pick up the phone and ask. Or, call the maker of PVC pipe and ask. Some questions you just need to ask the manufacture or supplier!