Good question, I have not done plastics yet but I’ve had to deal with static. Do you have a bare wire inside your vacuum pipe to discharge the static to ground? I purchase a roll of bare stranded wire at Home Despot and installed it on my vacuum tube. You may want to also glue some inside your bucket.
I found this document at Lee Valley that provides instructions on how to run the wire to remove the static.
03j6112ie.pdf (129.8 KB)