i have been doing nails now for bout 6 months im gettin better all the time at my infills and rebalances but some time i may get the odd customers with a nail thats very stained around zone 3 when ive filed it its still stained as i operated from a tanning salon i think it could be from the DHA in some of the tanning creams or from the spray tan booth, is there a way of getting rid of the staining so i dont have to keep chasing all the way to the smile line !!!!!!