Vacuuming after ultrasonic vinyl cleaning

For anyone who is a proponent of vacuuming their vinyl after an ultrasonic cleaning rather than letting it fan dry, since both sides will be wet how do you protect the "down" wet side during the process? My VPI 16.5 has a foam mat, but that will get soaked over time and may transfer dust/ particles to the cleaned wet surface.

Thanks for any advice.......