.... you're not actually supposed to use Windex on acrylic (unless it's got a protective clear coat).
A tip from my days in hospitality & as househusband:
1) if necessary, clean major dirt with detergent & a soft cloth; then
2) use a capful or two of
methylated spirits in a small bucket/container of warm water, apply with damp cloth (or old windex spray bottle!) and immediately use clean, lint-free cloth to dry it off. No streaks. No fuss. Little cost.