SGC was quick off the mark!
Anyway, where plastic, rubber and glass are involved, I'd suggest silicone grease/spray/ release agent.
AFAIK, the basis of WD40 is fish-oil, very effective 40 th. attempt to formulate a Water Dispersant.....However, it dries outand becomes viscous. Silicone doesn't and does not attack most plastics. Also commonly sold in car-accessory shops as Vinyl shine or Dashboard cleaner . Sewing suppliers(haberdashers) sell it for machining plastics/rubbers/tarpaulins.....makes the material slide under the needle without puckering and bunching!