I was thinking you could unbolt them and take them down there, offer them up against the wall and blast away, or get a mate to hold them so they don't fly off.

I've taken engines, blocks and diffs with me down there to clean up. Go at 6am when there is no-one there to stare at you and take a couple small bottle of soapy degreaser.

Other wise try the paint stripper but be careful working with that stuff upside down in under the guard, if it drips on your arms it burns like fire.