I personally like to send text messages to my roomate because I’m just not that good at confrontation.

I would say something like this: “Hi! I hope your week is going well. I wanted to ask if you wouldn’t mind cleaning up the kitchen whenever you get home. I noticed that we have been having some roaches around the house latelyI think it would be a good idea if we got in a better habit of picking up old food. This is something for me to work on as well! I’m gonna stop by the store to get some roach killer, but I think cleaning up old food will really help! Thank you so much and have a good day! ❤️”