My windscreen has a waxy resin left on it after using a car wash - how to I clean it off?

My Subaru Forester has been hand washed in a commercial car wash that has left a film of wax/resin on the screen. I've tried several means of cleaning, including vinegar and Mentholated spirit - but to no avail. It's severely obscures my vision in bright sunlight. How do I clean it?

Asked on 4 January 2018 by Peter Costen

Answered by Honest John
Mer windscreen cleaner that goes on as a liquid but dries to a mildly abrasive powder.
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