For clients who cannot afford to buy retail products connected with the tan, would it not be possible to advise them just to use plain old soap and water prior to a spray tan. I'm no expert but maybe a baby soap or unperfumed one might be ok. The plainer the better, i.e. avoid soaps which promise moisturised skin as these may contain a barrier. Also if the soap/shower gel is rinsed properly would this not eliminate the problem?
Feel free to shoot me if I am way off the mark (lol):lol: