Best tape to put for sale signs in the window

Currently I use duct tape to put for sale signs in the window of mobile homes. It sometimes falls off with the heat, wind and sun. It also leaves marks after I pull it off the window. Does anyone have a better way of getting for sale signs to stay in the window? Thanks!

Screw a couple of hooks into the top of the window frame and hang the sign from wires.
I use a real estate sized sign attached to the exterior of the front of the home, on a stake against the front of the home or on a porch railing if it is close to the front of the home.