Clean them and polish them using a good quality metal polish, and then treat them with Blackfire All Metal Sealant. This is a high temperature resistant polymer sealant that will prevent soot from bonding for 3-4 months at a time, meaning it can be washed off with just a wash mitt during the wash normal process. Tried and tested, even on high performance jap cars that kick out mental heat - it works! It also makes a great wheel sealant too. Details on this link...
In fact the last time I did them was around 6 months ago and I just wipe them with my "wheel" sponge everytime I wash the car and they are as good as new.
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