Answer:
bucket of powdered sanitizer
Step-by-step explanation:
Containers in which chemicals have been stored cannot be reused, much less to store food. This is because the risk of residue in such containers is very high and even clean and sanitized, these containers can contaminate the food stored in it.
Also, containers used with chemicals are not designed to ensure food safety.
For this reason, we can say that a bucket of powdered sanitizer cannot be used to store food. Even after clean.