definitely would contact your dm and let them know you have tried to get all your managers attention and it’s not being resolved

Ah. I used to work in a store like this. One thing that helps with the gnats is keeping your sani rags and used mop heads stored in a bag in bin with a lid. As far as shitty managers go, i second speaking to your DM about the matter

Couple of options, but probably beyond your paygrade and it needs motivated people. A call can be made for pest control to visit, but only so much they can do (although I think our store had overnight treatments done before).

Otherwise, when I was closing (or had barista friends closing on other nights), we'd do a specific cleaning regiment to avoid the issue. The walls near cold bar would get wiped down with sanitizer and syrup bottles rinsed off (so basically no overnight sugar). We'd clean the drains near bar with cleaner (I think I need to officially say cream cleanser, but restroom was definitely not used at all since that's not allowed officially), then flush it with buckets of sani + hot water (one of each normally). We'd then leave ice in the drains overnight, both at the floor and in the sink to ensure flies couldn't easily come back up.

After repeating this daily for a week, it definitely got better but if you neglect the store, it goes back to being bad.

Your SM should be having conversations with your SSVs and helping them with a plan. There is routine cleaning that should be done in every part of the day to help reduce the bug problem. It's your SSVs job to delegate cleaning tasks to baristas, and make sure baristas are doing the cleaning correctly and at the right times. It's your SMs job to make sure that the SSVs make sure the cleaning gets done. And if you don't see that happening it's time to contact your DM.

Sammeee but mine is fungus flies, the under part of our sink is all rotted wood and we have flies like crazy. (I work at a licensed store not for Starbucks) but I've complained to tons of ppl all the way up to DM and nobody cares 😀 it's disgusting especially in summer

You should have pest control by Ecolab or another professional service and if let them know (call the local rep directly if you have a number - if not submit a ticket) and they’ll bring you a solution and bottle specifically to spray the drains with just before you exit after closing. Works like magic!
Another remedy is plain white vinegar. Put in spray bottle and spray inside and around all drains and sinks at the same time as you’d use the other stuff before leaving at night. Works almost as well! And it’s super cheap. Good luck 🍀

Same here dude it’s disgusting