Question

what is a safe way of disposing a empty bottle of shampoo​

Answer 1

For bottles that can be completely emptied of their contents – remove as much of the product directly into the trash where it will go into a landfill. Do not rinse the bottle out, but you can take a paper towel and wipe it clean. If the bottle is plastic or glass you can recycle it afterward.

Answer 2

the safe way of disposing an empty plastic shampoo bottle is to send it for recycling so that that plastic can be further processed and new goods are produced

this is one of the eco-friendly parctices...

HOPE IT HELPS U BUDDY;)