Stop flushing and harvest a healthy plant instead, flushing is a complete waste of time and merely starves your plant when it needs the nutrients most. And guess where all those nutes you think your "flushing" are going?? The plant knows its dying, its only goal is to reproduce....... hasn't anyone ever noticed how GREEN the buds are on a flushed plant? THAT is where they end up, so flushing is also a self defeating effort.
And nothing you put into a plant can be removed.
https://www.autoflower.org/threads/flushing-the-myth-that-wont-die.56274/