I need three different kinds of screw drivers to fully open?

I have the liberation kit which opens the first bottom two screws and quite a few inside but there are about 3 screws that just won't budge with either driver? These screws seem to be too big for the pentalobe but too small for the phillips. They are cross shaped; one gold-colored screw near the cellular antenna after removing the battery near the bottom and two towards the other on the top panel that covers the power and sensor cable.

I assume I have the Phillips #00 Screwdriver but these need a #000?

What do you guys suggest?

I recently "dipped" the bottom of my iphone 4 CDMA in soapy water. I read the article on what to do about that, I am just trying to open up my phone, clean it, and replace the battery to see if everything will work like before, since it can turn on when plugged in, make calls/text and has all the information.

Thanks!