a metal grate or strong mesh with games no bigger than 1/5 of an inch will go a long way to keeping them out.
Also, you can get rat bait stations and bait from a do it yourself pest control store fairly cheap now a days and put it a few feet away from the vent (look for grease stains around the vent to see where they traffic) and wipe them out for good. ... View related article.
I had this problem when I was replacing some wood rot in my kitchen.
You'll need to reduce moisture conditions (check pipes for leaks and excessive moisture too) as much as possible and invest in a couple of tubes of silicon caulking to seal up any points of entry they might have and replacing anything that has rot in it
The problem with spreading beer out is that it will kill some slugs, you risk attracting roaches and ants in large numbers. Take some salt and mix it in water and lightly spray it in areas where you find the slugs most often and routinely clean with stuff that has bleach in it.
Termites are difficult to take care of on your own, they are just one of those pests that can do considerable damage and a limited number of effective treatments exist.
If you're in central florida, so I'm not exactly close enough to help directly and central florida people can call me at 407 292-4800, but I also have a blog Xterm Pest Control with some pest prevention tips at http://www.xtermpest.com/bugblog that might help make your home less attractive to termites.
Termidor is one of the most effective items to use to kill termites and it has a residual effect so it can spread across the whole colony, but it's pricey and I definitely recommend you have it professionally done.
Your home construction also matters too, a block home can be easily defended from termites -- but not a wood home. ... View related article.
