plastic

Hey, my friend thought it would be funny to pull off random tubes on my engine to, and I quote, "see what happens'. In doing so he has managed to snap one of the tubes as it was as brittle as glass. Has anyone got any idea what they do, where they go and how I can replace them? Thanks - Connor...

Hi I have an Audi A3 2011 plate. What detailing products have you used on the chrome part of the front grill please? I believe it's plastic... Reluctant to use Autosol Chrome polish as that's not to be used against plastic...

as title says... got swirls on the black plastic B-Pillar. Does anyone of the collective knowledge know best method to either reduce or remove the swirls? I was thinking of the plastic headlight scratch remover (meguiars) and fluff pad but given the position and the kind of 'in-your-face'...