Im using this product and have a great tan but when u bathe does it come off easily and should i ex foliate or will that make it come off completely??

i use it all the time cos it is so easy to use and dosnt go streaky
the only down side tho is that it does come off with water very easily bit of a bummer if ur caught out in the rain lol
exfoliating will make it look even better as ur skin wont be flakey or dry underneath