As a taxidermist, I always suggest no products be sprayed on the mounts. The feather duster is your best bet. If they get dirty, spraying windex or another GOOD window cleaner ON THE RAG, not the mount, then gently wiping, will help. WD-40 and other products are often suggested to help, but that itself attracts and holds dust. Your very best bet is always preventive maintanence, cleaning and dusting before they get bad. I know, they sell mount sprays, but then again, companies also sell hair tonic to grow hair...