Do I exfoiate & moisturise the night before my spray tan??
Question: Or how soon before?
Answer: Exfoliate very well the evening before (if exfoliating with Baiden Mitten you can exfoliate up to 2 days before), you can moisturize if you wish, but on the day of the spray tan you need to have a shower to wash all the moisturizer off. Your skin has to be clear of any moisturizers (so no moisturizing soap or body wash) and you should not use deodorant or make up.
At the salon they might give you some light moisturizer to rub into your dry spots like knees, elbows, feet and hands but you only use a very small amount. That will stop your skin in those places absorbing too much solution and turning out darker than the rest of your body.