If the headlamp washers on your forester SF doesnt work anymore, you can 3D print this. Remove the nozzles, it will fit snuggly in the gaps.It will rest on top of your bumper.
I personaly added some superglue to the caps. The first where stolen.
STL (Stereolithography, filesize: 108 KB), OBJ (OBJ, filesize: 103 KB), FBX (Autodesk FBX, filesize: 58.1 KB)