My boy gets his old man out after every ride, so I give it a quick wipe,. He puts it straight back in to the old cave when I touch it.
He has now cottoned on to me and the sponge, so as soon as he sees the sponge it's gone. He gets it out when he thinks the coast is clear when the rug goes back.
But I've got a surprise for him, i've just bought some new sheath cleaning gel. Going to try it out this weekend.