Does anybody care to share the ways they've found to "recondition" stiff/brittle PLA filament?

I have a 1/2 full spool of tan 3mm PLA that I put away for awhile..., and it has become very very stiff and brittle. It might still be useable, but I thought I'd look into the possibility of restoring some flexibility to it first.

I've seen some mentions of processes involving hot water (e.g., immerse spool in 150-160F water for 30-40 sec, let dry)..., but I can't help but wonder if filament dimensions are adversely impacted.

Thx!