Yes, Selleys Original Sugar Soap can be used in the shower to clean floors and tiles.
Directions for use:
Be sure to NOTuse on aluminium and brass surfaces and if you do be sure to wipe off immediately. Also you need to rinse well from glass before product dries.
Alternatively a better solution for cleaning your shower is to use Selleys Complete Clean Bathroom & Shower Spray. Selleys Complete Clean Bathroom & Shower Spray is a household grade disinfectant cleaner that powers through tough soap scum, dirt and grime while killing 99.9% of germs (S. aureus and E. coli). Perfect for use on showers, bathtubs and toilets.