For several months now, I have had an ongoing itchy rash on the back of both hands, close to the area of my thumbs. For quite a while, I have been racking my brain trying to work out what might be causing it. My best guess was washing up, but I have always done at least my share of that. Then I realised the rash appeared when we swapped from Fairy, to Elbow Grease liquid - as it seemed to be just as good and a little cheaper.
On Thursday in the interests of experimentation, I picked up a 2L bottle of Fairy and have used that in the days since then (SWMBO is away). The rash now seems to have almost gone.