Does anyone have any tips on the best way of polishing/cleaning exhausts (the tips).........at the mo the tips look all grey and oxidised and rough.....I have even tried T-cut!

Autosol.
Cleans the crap off and polishes.

yep - and a bit of wire wool if it's really bad....

I used a bit of Duraglit Silver on mine and it brought the stubborn tar spots of aswell.

Oven cleaner. No, don't laugh - it's true. Following on from tips from Rodders_UK and Norkep I tried it on mine (they were shockingly bad) and they came up a treat!

Thanks people, I used wet and dry and the duraglit and that sorted the dirty, dark, yuccy tailpipes.............now looks as good as new!!

warning, do NOT polish after a drive..i found out the hard way
OUCH!