you’ve recently changed dishwashing liquid, you may not want to try a different, less scented/hypoallergenic detergent.
For outdoor water bowls, or multi-dog water bowls, you should be cleaning it a few times a day because of the exposure to the outdoor elements, multi dog use, and bugs.
How you should sanitize
Hand washing bowls is satisfactory. Use a mild detergent and be sure not to leave any residue behind. Residue could lead to ingest at the next feeding, and could upset your dog’s stomach. If your dog’s bowl is dishwasher safe, pop it in, but not with your own dishes, it can lead to contamination. If you don’t run the dishwasher every day, you may want to have a few bowls on hand to run one cycle with many bowls.
What kind of bowl to choose
Stainless steel or porcelain bowls may be the best choice for food and water. Ceramic or plastic bowls are porous, which could create a breeding ground for bacteria and germs, and may jeopardize your dog’s health.