To Clean Lookingglasses
Remove the fly stains, and other soil, by a damp rag; then polish with woollen cloth and powder-blue.
To Preserve Gilding, and Clean It
It is not possible to prevent flies from staining the gilding without covering it; before which, blow off the light dust, and pass a feather or clean brush over it; then with strips of paper cover the frames of your glasses, and do not remove it till the flies are gone.
Linen takes off the gilding, and deadens its brightness; it should therefore never be used for wiping it.
Some means should be used to destroy the flies, as they injure furniture of every kind, and the paper likewise. Bottles hung about with sugar and vinegar, or beer, will attract them; or fly water put into the bottom of a saucer.