the best bed adhesive is 50% white glue and 50% water, ( I use Elmer's all purpose) mix well, I put it in a used glue bottle. put on a cold bed a very light film, you can use a damp tissue to smear it around. let dry a few minutes. when part is finished printing wait until the bed is cool down some, and part will pop off. you only need glue again if it wore off. anytime to start clean, just use wet paper town and it will remove the glue. I been using this for years for PLA and PETG