https://support.deltafaucet.com/s/article/Removing-stuck-handle-set-screw

What to use or not to use with tub/shower units for installation and cleaning. https://support.deltafaucet.com/s/article/What-to-use-or-not-to-use-with-tub-shower-units

Using the proper cleaning supplies and non-abrasive cloths will keep your tub, shower base or wall looking new for a long time. However, if you use caustic cleaners or scratchy materials, you could do permanent damage. Here is our best advice for keeping your acrylic shower or tub clean and in mint condition. https://support.deltafaucet.com/s/article/How-do-I-clean-my-acrylic-bathing-products-1628028364992