How do girlies clean off lipstick from their FreeSip spouts??

I clean my Owala once a week by giving all parts a good soapy hot water bath and scrub but I have such a hard time getting lipstick off the spout, having to scrub at it with a scotch brite gentle sponge. Is there an easier way to get off lipstick? Especially on the inside corners of the spout, it’s hard!! There’s gotta be an easier way, right?? :(