Please explain, what do you mean by swirls??
Be careful!! !!!!!
It is more than likely the aluminuim manufacturing surface that you are seeing!!! The front plates on the BL4000 are not mirror perfect like they appear to be in photos, all though they are very shiny, they are not without light marks!
“Quality is never an accident; it is always the result of intelligent effort.”
Your health and well-being comes first and fore-most.