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Hi Alecd - if that was the case would it not show on the roof liner first - just a thought. I would be very wary of using chemicals as they might cause damage to paintwork, plastic, sealants, upholstery, etc. Try a piece of curtain wire with the plastic stripped of one end and stretch it slightly so the end looks like a corkscrew. As you push the wire it keep turning it so it almost acts like a drill. A solution of vinegar and water may help soften and blocked residue.
Currently in madnoel10's garage:
Honda Civic 1.4l