You mean Sudocrem I think! In the grey pot. Lots of people swear by this.

My DS had very sensitive skin...the only thing that kept nappy rash away was Aromababy Barrier Balm...not Bepanthen, Sudocrem etc (but "natural" products didn't help his eczema, he was a tricky customer! I used disposable wipes and disposable nappies on him no problem (apart from Amolin wipes).

DD's skin is not as sensitive, I can use just about anything on her except Sudocrem...but I'm now phasing in more "gentle" products to use on her, I figure if she doesn't need the "hard stuff" why use it, IYKWIM.

The other thing to look at is laundry detergent...the only 3 brands that didn't give my DS eczema and just generally irritate his skin were Omo Sensitive, Bio-Zet and Ecostore.