very hard to find colourless one

I like to keep the toilet clean and find it easy to throw one of these in the cistern and it cleans the toilet so easy then after a few flushes I go back and do the brush if any marks or gunk coming out when you flush, but I like the blue better but if only white I usually buy one.

I prefer the in cistern blocks that are blue and colour the water as well as clean the toilet. I do like White king bleach toilet cleaner in this block form and also the toilet gel.