This is good intel, especially for a newbie. Where would one purchase Doxit? I typically use 70% alcohol, and it has worked well so far, but I always like getting the best for the job, if I can afford it!
I highly recommend DeoxIT. I work with electronics all day and much of it is repair work. We have tried all types of contact cleaners and DeoxIT works wonders and keeps the contacts looking good for a long time. Grab a bottle and it will last you a long time if all you are doing is cleaning your light contacts once in a while. I just cleaned my Quark 123 contacts with it the other day and they look as good as new now.
One problem I had with my Maglite was it was intermittently going on and off but, the solution was to take out the spring and put it back in. It works perfectly!