Bug-B-Gon ECO

I am using Bug-B-Gon ECO on my plants at the recommendation of a guy that runs a hydroponics store.
I started spider mites and he said it would be safe to use on weed.
He seems to have a ton of info and says he has been growing for years.

I am mixing 20 ML to 1 Litre of water.
I made sure to get both top and bottom of leaves.

Am I supposed to wash it off after use?
How can I wash it well and they are potted?

I am concerned because my wife will be smoking this and I want to be sure its safe.
Does anyone else have experience with this product and can maybe offer advice or experiences.

Cheers and thank you

Looks like it's pyrethrins based, I would look into what else is in there just to be sure. But pyrethrins are fairly safe.

Hello,
I know your post is 2 years old but just wanted to know if you still use Bug B gone eco? If so at what dose 20ml per litre?
Thanks