I found a bottle of dish detergent from years ago. It appears discoloured. I checked online to see whether it works as toilet bowl cleaner. I found that it might help in unclogging toilets, but there is warning against using it regularly for toilets because it's bad for gaskets and seals. However, the warning often (not always) pertains to using dish detergent in the water reservoir tank. So it is unclear whether the warning applies to using dish detergent in the toilet bowl. What do plumbers...
