Yes, make sure your eyelashes are clean. Remove all traces of eye makeup – prior to your appointment. Use an oil-free make up remover if possible, and rinse well.
Any traces of oil or makeup (especially mascara!) will create a barrier between the adhesive and your natural lashes, causing your extensions to drop off prematurely.
At Lash it up all lashes are prepped with a cleanser and primer before the application starts.