the turbo is fed oil from your engine as it spins around super fast and needs lubrication.
when the turbo is knackered and the seals go, it blows a lot of this hot oil mist down the rubber pipe into the intercooler up the other pipe and into the intake manifold.
when it goes into the intercooler, it gets cooled and forms back into liquid oil and collects at the lowest point, the bottom pipe joint.
so if you take it off and find it is full of oil, then you know it's your turbo oil seals.
you clean it by removing the intercooler (few bolts) and sticking in parrafin or petrol closing the pipe holes and jumping up and down. your husband may watch or post a youtube video of this if you desire.
wait a few hours, pour it out, stick a hosepipe on it for a while, pour it out and leave it to dry. basically give it a good clean, it's just a metal container