Lots of lash techs have been using water coatings or nano misters for a while to speed up the polymerization process. Some lash techs use primers (alcohol based) which are also acceptable. Water can deal with this as well, but it's better to use distilled or boiled water (it contains no bacteria or microorganisms).
Thus, after you placed your last lash (or a fan), wait for approximately 5 minutes (you can clean your work place, for example) to let the glue dry from the outside. And then you can wash the client's lashes with a wet microbrush.