Birds dont urinateI found a new tip . I put in a spraying bottle half of pure ammonia and half white vinegar, and I spray the mixture all around and underneath the van (I don't spray the tyres) . Instant running away! It smells like their worst predator's urine which are supposed to be birds of (s)pray (lol). I've done this in my caravan... never saw the one rat I had in, last winter. If it works for rats I bet it does for the mice! Do be careful though when spraying it, don't smell it on purpose ... it's really strong, and makes you dizzy!