The two front drain holes should be easily visible in the front corners of the sunroof aperture,the rear ones can be more awkward to see.I use curtain wire[the plastic coated stuff generally used for net curtains]you don't want to use anything "pointy" or sharp as this could puncture the drain tubes.If you can't see the rear ones from the top find where the tubes exit[usually in the rear arch so you may have to remove arch liner if fitted]and clear them from that end taking care not to get wet if/when they empty out!
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