oh hun i feel your pain.
DS was like this and even when he was TT it continued as he didnt clean it properly and would leave wee in the skin and it would get infected.
we found it didnt matter what soaps we used it irritated it. the only thing which didnt was dermawash its a soap free ph balanced wash based on a sorbolene creme base, its great i use it now aswell and has helped ease my itching in late pregnancy.
we did get DS circumsised but that was because we were fed up with infections and it causibng him pain, we havent had an issue since.
we did wait it out till he was 8 though and we have also noticed a reduction in his bed wetting aswell it was weekly and always when he had an infection now its monthly