When it comes to products to care for and make your tan last longer its best to read ingredients first. When using a body wash make sure its SLS's free, most body washes that are highly commercialized will have SLS's in them. Its a cheap detergent and it can strip or make a sunless tan appear streaky NOT good. Use the best quality you can afford, I usually recommend either one that I carry or a more natural one from the health food section in your grocery store or drug store.
When it comes to lotions same thing applies...go for the best you can afford and stay away from Petrochemicals; mineral oil and petroleum which can break down a sunless tan faster. Also remember your skin absorbes at least 60% of what you put on it!! Take care of you skin and choose "Green" products you biggest organ will thank you! (smile!)
I always have specific lotions and body washes and tan extenders to care for your tan when I arrive for your appointment so feel free to ask. Remember to get best and longest lasting results...EXFOLIATE well before your apptointment and keep your skin well HYDRATED with lotion at least once a day.