It's the UV rays from the sun that will destroy plastic and make it brittle, not snow or water. If they haven't been sitting out there all year, they should be fine, just give your vehicle a good shake before you get under once on the ramps. If you have jack stands it wouldn't hurt to place them under there just in case, but don't forget to remove them before you try to drive off the ramp...
Lots of plastic things being used in hospitals to keep folks from dying . Lots of plastic clips in your vehicle holding sensors etc that keep you alive when driving down the highway at 100kmph or more.
Do you have PVC window frames? How are they holding up to sub zero temperatures and UV exposure, LOL.
Both vehicles that I currently change the oil on have the drain plug at the rear side of the oil pan so I think that having the front end raised up helps get more of the oil out.
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