Exhaust needs some 00 grade wire wool, some Autosol Metal Polish, and plenty of enbow grease!!
I have tons of wire wool if you want some mate - may even be able to dig out some autosol metal polish as well.
I used to use it on my ED30, but since I sol dthat I dont really use it on my soot chucker any more!
In reagrds to the patch on the roof - that doesnt look like bird poo to me. Thats looks like bloody Eagle Poo!