Membrane type rain gear, GoreTex, Entrant,etc, usually marketed as being "Waterproof-Breathable" requires, as others have said, a DWR treatment on the surface. Keeping the garment clean, preferably with a suitable tecwash, and tumble drying, is enough to keep the garment up to snuff, for 1-2 years, depending on quality and use. When reapplying the DWR, use a wash in type for 3 layer membranes ( perversely, these are the ones that seem to be one layer of cloth ) and a spray on for 2, or 2 and half layer garments. Those are the ones that have some form of separate liner. Regular "plastic" waterproofs, use some kind of tent waterproofer. I don't recommend that type of rain gear for cycling, you get so sweaty that you're just as wet at the end, anyway. I usually suggest something in GoreTex Paclite or pro shell, or Entrant, and something with suitable venting.