So here is a picture of the pipes after an initial couple of blasts with the spray cleaner. Actually about an hours work.
A truly filthy, stinky, job so far, with the inevitable mess splashed about on Fred's pristine paintwork.
I hasten to add that the damage to the fins was there when I opened the casing, and was not done by me. Obviously someone else has been in there before me.
With a bit of cleaning, I was somewhat surprised to see the pipes and fins appear to be made of copper.
I had originally intended to continue to use the spray cleaner to get an ok job done, until reading last night's anonymous post. The suggestion was I make up perspex covers and flush cleaner fluid through the intercooler using a pump.
That flushing fluid idea is so simple and elegant, but should prove to be extremely effective, that I think I'll give it a go. I have pretty much everything I need to hand - just need to buy a few tank fittings for the perspex covers and I'll be away.
I know it will take longer, but the job will be so much less messy and will most likely be worth the extra effort in the long run.
Thanks again to whoever it was that made the suggestion.