How can I easily clean a filthy bathtub without bending over?

https://www.hometalk.com/diy/clean/bathroom/cleaning-the-tub-without-breaking-your-back-40701567

Clean the Tub Without Breaking Your Back

Before you clean, use an old plastic credit card to scrape off any grime, soap scum or hardened dirt. Keep scraping until the shower wall is free of filth. Then rinse with water and use cleaning products to finish the clean-up.

Purchase a rechargeable spin scrubber that is on a long handle. I would highly recommend purchasing one. Then you can use Lysol Power Bathroom Cleaner in the blue spray bottle or Lysol Lime & Rust Remover Toilet Bowl cleaner in a black squirt bottle. Spray and let it sit for a couple of minutes then hit with the scrubber.

A mop or a broom, or a mr clean mop head . Depending on what the tub itself is made of depends on what to clean it with.