was a regular routine when i had #860. also a place to note is the gap between the arch line and where the sill starts, big mud trap there. same both front and rear. i cleaned them all out and wax oiled it you have to peel back the wheel arch liner to get at them.
heres 860's hope Silver one has kept them up to standard.
here's some of 860
And some of the cerbera's
Plan is to remove all suspension compenents in the next few days / weeks, remove all the bushes, get them re powder coated and new poly bushes fitted, then aligned and MOT, once i've done the suspension with new gaz gold adjustable coil overs.