Back when I had a metal prop, I would occasionally wipe it with a light coat of oil, nothing crazy. It reminded me of care one may give their favorite shotgun at times. With a composite prop, MT in this case, I don’t see much mention besides cleaning with mild soapy water? Besides that, anything to keep a composite prop looking clean, shiny & new? Can’t help but think there may be a ‘wax’ of some type to use? This all assumes the prop is clean 1st. I’m not talking about looking for nicks or any type of maintenance, just casual care from the owner. I haven’t seen much mention with a net search.