How do I kill red spider mites on houseplants?

Spray the plant with a mixture of dish soap ( teaspoon ) & water in a spray bottle. Make sure it is foamy. Rinse plant off after a couple minutes.

Maybe find a spray that has pyrethum.

Here's a post that might help you - https://getbusygardening.com/control-spider-mites/

some of these tips might help: https://www.craftylittlegnome.com/fungus-gnats-houseplants/

Hi Michaelene: Soap sprays are a natural way to kill spider mites. Combine two tablespoons of gentle soap, one to two tablespoons of cooking oil, and a gallon of water. Spray plants thoroughly, repeating every four to seven days until spider mites appear gone. Good luck