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For the underside of the exhausts, Autoglym Intensive Tar Remover is the stuff. The "oil leak" is crud from the chain, so changing to a thicker chain lube that doesn't get flung off so badly might help.
To clean the exhausts, first get the worst of the grime off with your usual products. I normally use SDoc 100 gel spray, which does a pretty good job of getting 90% of the muck off the rest of the bike with very little effort. For the worst areas, including the exhausts, a stiff brush like the type sold for cleaning alloy wheels gets it in to the nooks and crannies where oil and road grime tend to collect. Be careful not to scratch anything.
Once the exhaust cans are free of loose dirt and grit, pour some of the Autoglym tar remover onto a soft cloth, wipe onto the exhaust cans, and wait for a couple of minutes before wiping off. Finally rinse with clean water and you're done.
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