Washing old flower plant pots for reuse is an excellent money saver for offices and homes alike. While the process is time consuming for those cleaning clay pots, it is worth the effort. The total cost comes out to less than 10 cents per wash, and the result is a sterile pot ready for use. For the best results, always use fresh potting soil in the newly cleaned pots.
Remove the old plants from the pots and dispose of all the old potting soil.
Wash the pot with soap and water to further remove any soil and hard water buildup from the pot.
Sterilize the pot by soaking it in a mixture of one part bleach and nine parts water for at least three hours. This will kill any diseases, bacteria or fungus that might have developed in the pot from its prior use. Remove the pot from the soak. If the pot is plastic, rinse under running water and dry. If the pot is made of clay, then soak the pot in clean water for at least three hours to remove all the bleach.