I believe the washing up liquid and salt destroying your bikes metal components is a bit going too far and scares people off by those saying do not use it for that reason, used sensibly, wash your bike and a good rinse off will cause no problems at all apart from the comment in the last sentence at the bottom.
If washing up liquid is that bad, how much cutlery and other kitchen metalware and how much of that is plated gets washed in it every day etc including plated sinks which have drips of it left to dry up on it every day, but I do not hear complaints about damage to such items.
I ride my best bike throughout winter and it must come into more contact with salt than what would be in a small amount of washing up liquid, and as I always rinse off my bike on getting home, it shows no salt damage.
But as 2pedalstez mentions it will strip off layers of wax polish etc from your bike and it would also be undesirable like any other degreaser to get into your BB or other bearings unless you can flush it out.
If washing up liquid is that bad, how much cutlery and other kitchen metalware and how much of that is plated gets washed in it every day etc including plated sinks which have drips of it left to dry up on it every day, but I do not hear complaints about damage to such items.
I ride my best bike throughout winter and it must come into more contact with salt than what would be in a small amount of washing up liquid, and as I always rinse off my bike on getting home, it shows no salt damage.
But as 2pedalstez mentions it will strip off layers of wax polish etc from your bike and it would also be undesirable like any other degreaser to get into your BB or other bearings unless you can flush it out.