what will soften plastic and once it drie,s the plastic will harden up once more?
If the plastic can be heated you can warm it in the oven, shape it and let it cool. Some plastic modeling clays are like this. Anything you pour on the plastic like a solvent will break the chemical bonds of the plastic and make it useless.
Does notebook need .......?
Every latest note book has a cooler for the chips to contain the heat emission and built in cooler is for various functions to maintain the speed.
Where can I find he how to make plastic bread for first aid?
Take some plastic flour and some plastic salt, rub in some plastic butter, mix with some plastic water, knead and cook in a plastic oven in the usual way... ... sheesh - how else would you make it??