No probs

Aye exactly it takes away some of the reason for having and intercooler in the first place. For removing that oily grime your best bet is acetone and a cloth, but if you can't get hold of that, then whitespirit or IPA will do the trick. Even WD40 would probably do an alright job. Just if you decided to use whitespirit or ipa inside to flush it out, leave it to evaporate for a long while. Otherwise when you start your car it'll rev its bollocks off and theres nothing you can do lol. One of my mates did it once, never ran so fast in my life. Acetone however evaporates very fast.
Bit concerned if your pipe has an oil leak, loosing a little bit of boost as you know but also means your whole system is probably got a nice lining of oil in it, if I was you I would give it all a good clean out then put a breather filter on, to stop your intake pulling oily thumes in.
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