m0useanswered grow question a year ago D earth = diatomaceous earth? its calcium just water it in. plane water can be used to wash it off the plants or look up something called bud washing and read into it. it used lemon juice and baking soda to clean the plants post harvest, I like doing this on my buds regardless of growing style.
Cloneing autoflower is not really a thing, yes they can be cloned, howveer they follow the same timeline as the parents, and taking clones is like topping and very stress full for a plant on a limited lifeline. You can't veg them out and all the stress of cloning causes them to be so small its not worth the time or effort, this stands true for the clone and the parent it was taken from.
If you know some magic trick to trick a autoflower to stay in veg. then yes very possible and would be a major discovery for cannabis growers, but as far as I know; not an option.
Good Luck!