Get a pipe cleaner coat hanger popsicle stick or just about anything else that will fit through the weep holes and clean them out.
How to clean sliding door weep holes.
How window weep holes work anlin windows doors duration.
How to clean sliding door or window tracks duration.
Rub the marked area from several different directions.
First remove any large particles with a soft bristle brush.
If the mark still remains on the room facing low e glass surface apply a small amount of bar keepers friend or cerama bryte.
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Never use abrasive or acidic cleaners they might cause permanent damage to the frame finish.
Then wash the surface using warm water a mild detergent and a soft absorbent cloth.
Older tracks without weep holes may need to have some drilled.
Do you have water leaking in through your pvc door.
Once clean you should be able to pour a small pitcher of water into the track and watch it migrate to the weep holes and trickle outside.
Than maybe the drainage holes are blocked.
Never use a dry cloth as hard particles can abrade the finish.