you might find it's the nappies rather than his wee, unless he's a bit dehydrated and the wee is quite dark and smelly? Def give a strip wash a go. I find when there's soap buildup on the nappies it only takes one wee for it to smell really wee-y and stale.
Rocking Green washing powder is great for smelly nappies (you need to buy it online - it's a special cloth nappy one). We found once DS started sleeping 12 hours we just had to use a disposable at night (got nice natural ones without all the chemicals and that are biodegradable). He smelt awful in the morning in cloth!
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