Hi Folliman,
That's a critical area. It's important to properly clean the front lace to have an undetectable hair line. I use the mirror slide---only I don't use a mirror. In order to avoid cleaning up a mirror I use a page from a glossy magazine and then just throw it away. Any smooth clean surface will do the trick. I've found that the glossy magazine page is the easiest for me. But even after I've done the slide I find that some glue can sometimes get trapped in the lace. I use a tooth pick to push the glue through the lace towards the bottom of the lace and do the slide again---gently so as not to push the glue through the lace again---I want it to end up on the glossy magazine page.
Regards,
John
http://www.toplace.com