I was in a rush today, and tossed a packet of VPX Zero Impact (gross in my personal opinion) in a new shaker cup and downed it. Is it safe to just use a shaker cup straight from the factory? I usually wash them out with water first, but this time I was in a rush, and have a free one from Vitamin Shoppe sitting on my counter in a bag. It had a STRONG plastic smell, but it didn't effect the test. Just worried if using it like this is un-safe.