How to turn cheats off?

[Eoin Lynne]

I'm not going to rebuild my entire base all over again. I last played before the big update that forced everyone to have to make a new save (long ago). I want to play again so I need to use FASTBUILD and NOCOST. How do I turn them off when I am done?

[Dragonlord3344]

type fastbuild and nocost again, should say values where changed to false, idk about experimental build.