Super Safe T Bowl citric acid cleaner can safely remove soap scum off showers, tubs and tile.  A mild daily use bowl cleaner.   Sold only in Quarts.

SDS

http://genlabscorp.com/ghspdf/03923_EN.pdf

NOTE: THIS ITEM IS NO LONGER STOCKED. FOR A QUART SIZE BOWL CLEANER OR A RESTROOM TILE CLEANER, PLEASE REFER TO THE LINKS BELOW.

https://deltadistributing.net/product/genlabs-emulsion-bowl-cleaner/ (Bowl Cleaner)

https://deltadistributing.net/product/lime-out-quarts-case/ (Restroom Tile Cleaner)