Boiling parts?

[KRob]

Got myself a Traxxas TRX-1 at last and seen on a couple of threads that that original white plastic can be a bit brittle. As this will be a runner (hopefully ready for the Iconic Revival) it's spooked me a bit.
So I plan on giving the plastics a boil to soften them up a little - but is there a secret to how long to do this for? Depends on the plastic I guess but an idea would be good - unless it makes no difference how long.