I got several qts of vegetable oil and made sure all tanks were empty and had the RV tilted , high in frount and leaning away from the door.
Started with gray 1 and dumped it in went out to the docking station and pulled the handle and quickly opened and closed to get the oil all over the slide valve , did this thru all the tanks and it has them all lubed and operating like new . When it goes back in service this spring I will be using calgon or valve lube to keep things working.
‘Thanks for the input
BD