It is vital that you take care of your lashes so that they are long lasting and healthy. "Extensions will not stick to dirty lashes!" Dirty lashes can still be a thing even if you don't wear any makeup! Now we wouldn't skip a day of brushing our teeth, so why would lash cleansing be any different? Wearing lash extensions makes it easier for bacteria growth because of the extra lashes, so it is your job as the client to wash your lashes and lash line thoroughly everyday as well as your cleansing brush frequently with antibacterial soap! Just like how you should brush your teeth for 2 minutes, the same concept applies to lashes-wash with enough cleanser for about 20 seconds on each eye! If the suds disappear too quickly, then you need more cleanser! Don't be shy.