We had something similar happening and had the A/C & the trunk line replaced. The trunk line for the Supply & Return was 31 years old. We use the Best Quality Filters and still, the white film would show up intermittently. You may just need a Duct Cleaning.
I'm using a guy who is recommended for a dryer cleaning next week named Desmond. I'll let you know what I think about his service or just PM me on Wednesday if I forget. Good Luck.
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