Found the following posts on a US forum with regard to using detergent........

Has anyone tried using dish detergent for patch lube. I have been told it works very well and allows multiple shots without cleaning the barrel.
I'll do that whenever GE recommends Bore Butter for washing my dishes.

Just a little fun, but truthfully, I doubt the claims.
I must admit I've never heard that before.

I don't think it would work well as a lube, but for cleaning just add to some hot soapy water and go for it.

Ahhh the myth is reborn! I had heard this several years ago. I never tried it, being fond of my "seasoned" barrels, but my brother being the technology hound that he is, did try it and found it to be not true. It was no help in cleaning and shot less accurately than conventional lubes. He also found that the bore would haze or begin to rust quickly if it wasn't cleaned and re lubed the same day. On the other side of the coin, a friend used Ivory dish soap and had good results with it. Last time I spoke to him (couple years ago)he was still using it, and there were no ill affects.