yep as sean says andy
tidy up any scratches with a mini file
take all the hardware off
put some gloves on
pop it in a bag ( the food bags with the seal across the top are great for this )
put a small amount of oven pride in
work the liquid around the lever using your fingers ( through the bag )
the liquid will start to turn the colour of the anno and foam up
dont leave it in there too long
drop it out of bag into water and rinse
if a few bits of anno persist you could always repeat and concentrate the liquid on these areas
give it a quick once over with autosol