Bathtub Trim What Do I Do With Wooden Window Trim And Sill In The Bathtub Area?

What do I do with wooden window trim and sill in the bathtub area? - bathtub trim

The previous owner installed a new window with a white metal frame in the cockpit, but left the window Wood trim and thresholds, which prevents me from using the shower. The pool is tiled in very good condition, I believe (in the color of the pink and black are now), I have to adjust the window to the threshold and 3 layers of paint bath, but I'm not sure I stop, wood decay use in time with shower. What can I do with the window seat and the door allows you to my shower?