Its easiest just to go in and get youre alignment directly after you put on the camber kit (or when you have the shop do it). If you do the washer thing, you should get an alignment right after that too. Just pointing out the obvious Unfortunately some of us are lazy and/or broke.

but my roommates old teg has been on washer rear camber adjustment (h&r sport) for almost four years under normal (agressive to the average person) driving. He hasn't had any problems (related to that anyway, the car's a POS tho)