Take care removing the screws that go onto the inlet adaptors, the manifold-like thing. If you drop one you won't be able to retrieve it unless by luck it lodges on something nearby - it will more than likely fall down deep and you won't even be able to see it: even more so for the washers. The gaskets underneath are quite easily damaged and are also quite expensive. The originals are a green colour so you'll know if non-original parts have been used on it. Check the rubber tubes for splits - they should be soft and pliable but do harden with age.
When putting the screws back - a bit fiddly - be careful not to overtighten them. They only go into relatively thin aluminium on the adaptors and easy to damage.
After polishing the things, wax the outsides as chrome is porous. Not sure what's best to use - wheel wax maybe. As already stated, use the proper tool on the Clic-R thingies.
