Never use abrasive or acidic cleaners they might cause permanent damage to the frame finish.
How to clean sliding door weep holes.
First remove any large particles with a soft bristle brush.
Than maybe the drainage holes are blocked.
Then wash the surface using warm water a mild detergent and a soft absorbent cloth.
Rub the marked area from several different directions.
Do you have water leaking in through your pvc door.
Get a pipe cleaner coat hanger popsicle stick or just about anything else that will fit through the weep holes and clean them out.
Older tracks without weep holes may need to have some drilled.
How to clean sliding door or window tracks duration.
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.
You can clean these in a matter of seconds just watch and see.
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Ceramic cooktop cleaner to a soft clean lint free microfiber cloth or paper towel.
Never use a dry cloth as hard particles can abrade the finish.