Adblue is a mixture of 32.5% urea (or carbamide) and 67.5% deionised water, for anyone interested.
Crikey - that's 5M urea if it is 32.5% w/v. That's the kind of concentration we use in the lab to solubilise "insoluble" proteins - and I concur with the comment that high molarity urea solutions leave horrible crystalline messes everywhere. It is also used in moisturisers to give "soft" skin - but knowing its effects at the protein level, it's not something I'd leave on skin for any length of time unless in a carefully formulated cosmetic.