fruit flies

hello all. i am a tiny bit of an over active cleaner, not to the point of it being a flaw though. i change my rats bedding every 3 to 4 days, sometimes sooner if they spilled alittle yogurt or it smells for other reasons. i change the water bottle every day and i take out any uneaten fresh veg...

Hi--I was wondering, has anyone ever had a problem with those pesty little fruit-like flies? Cages get cleaned regularly, trays & washing & scrubbing of total cage outside with the hose. All food is kept in airtight containers, humidity is not a problem. I put out red wine vinegar bowls per my...