Cleaning your models?

[Lester Perry]

Dust and dirt are a real problem for me. I don't know why, My layout building has a carpeted concrete floor. I covered the walls with plastic before starting the layout and have a drop ceiling. The building is dedicated to my layout, there is nothing else in it. I have just decided that the dust is natural weathering. That might be my dirty track problem but I don't know what to do about it. Yes I tried air cleaners that cerculate the air through a filter. They are a joke.