Any ideas to recycle hand soap bottles?

instead of buying more soap bottles to recycle, buy the cheapest shampoo and refill the soap bottles with shampoo and a little water.

i take an empty one , put some dawn in it, not a lot then fill with water. Don't need to be dawn but a small bottle of dawn is .97 cents. Use a couple t. Spoons then water. I keep it in my bathroom and after a day or two I squirt some in my stool , swish brush then to keep it fresh and clean

Don't buy anymore and use the ones you have by filling them with dish soap for hand washing.

Refill with half dish soap (I get a large one at Sam's to use around the house) and half vinegar. Keep it in the bath tub and use it for quick daily wipe downs to prolong time between deep scrubbings.