Clear Firefox cache, not cookies

So I have seen tons of ways to clear cache and cookies from Firefox, but I need to be able to clear cache and keep the cookies file. I have tried several different methods, but none seem to work for me. Here is my current code that is not currently working. Any help would be GREATLY appreciated.

    for %%i in (c:\users\%USERNAME%\AppData\Roaming\Mozilla\Firefox\Profiles\*) do if not "%%i"=="cookies.sqlite" del /q "%%i\*sqlite"