The rubber squeegees always seemed prone to scratches, but I've use the sponge type for 20 years without any problems. Store them clean and rinse them out well before using. I get the ones with the U-shaped plastic handles, and cut through the base of the U so that I get two paddles with sponges. Then I hold the plastic handles between the fingers of one hand at just the right spacing so that the sponge faces are parallel when together, and use my other hand on the sponge end to control the amount of compression on the film. It doesn't take much practice to get a very clean, controlled wipe.