I have 26 of them?
Bathtub is the easiest. I had them in my current home when I purchased the house. Got rid of them in favor of curtains and drapes that can easily be tossed in he washing machine when needed.
I put them in the shower and let them soak. Hang outside to dry. Or use kitchen tongs and a microfiber cloth damp with all purpose cleaner or a dusting spray to clean the slats while it's hanging up.
I soak them in the tub!
I personally like to fill my bathtub halfway with hot soapy water and a cup of cleaner (Mr Clean, etc). I use a sponge back cleaner you bathe with, and clean the front and back of all the mini blinds or you can just use a sponge. Works great! Drain tub and rinse off your blinds. I like to “drape” them over my patio furniture to dry or use your fence or dry by hand. You can easily swish these in your tub or use your child’s little swimming pool.