Cleaning iPhones crevices

The iPhone 4 is my second iPhone. My trusty 1st gen was with me for over two years, but by the end of its life the port at the bottom and all microphones and earpieces were full of dust and lint. Im fearing that my new phone is already headed in this direction. In addition, the earpiece (not sure if thats what its called; referring to the mesh piece above the display next to the front camera that I put up to my ear) received a drop of food that has hindered the loudness when I am on phone calls. Does anyone have any tips for:
keeping the USP slot clean?cleaning the bottom speakers?cleaning the mesh piece, or earpiece?Thank you!
MacBook Mac OS X (10.4.11)