Moths in cage

I keep noticing moths in my hamsters cage it’s not a massive amount maybe one or two. I’ve deep cleaned the enclosure twice and washed everything and changed the bedding. I last did this two days ago and I’ve just noticed another one. Does anyone know where they’re coming from!? My house is clean and it’s winter where I am so rarely see them. They’re nowhere else in the house just odd ones that are spotted in her enclosure. She doesn’t seem bothered or hurt just makes me feel icky thinking they’re in there with her!