First, dilute one capful of hydrogen peroxide in one liter of water.

Submerge the orchids by the roots and leave them for an hour and a half.
Peel the potatoes and place them in a container with a liter of water.
Then blend everything and filter the mixture into a container with a tight-fitting lid.
Cover it with a towel and leave it for an hour.
Meanwhile, apply ground cinnamon to the roots.
Then use the mixture of water and potato peel to moisten the affected plant with the help of a spray bottle