NEW DUST COVER CARE AND CLEANING

Howdy fellow turntables freaks,my dilemma is this,a little more than a year ago I purchased a Technics 1200G turntable. I have only cleaned it using a feather duster and never touching the plastic at all when opening or closing it.How do I clean it without putting micro swirl marks into the plastic,I'd love to hear about your cleaning methods-trying to maintain my perfect lid! Thanks