Using no tutorilas, I have discovered a way of making a wet look as well as droplets of fluids:

Find which area's of your picture (ie light colored area's). Using the magic wand, select the high area's, edit > Copy, then open a new document with a transpearent backgound, then paste.

Now, select the highest of these using the magic wand, you may have to use Select > All, then Edit > Copy Edit Paste to get all the highlights individually.

Once you have then use the Filter > Artistic > Plastic Wrap.

You may have to play with the adjustment. You can also adjust selected area's adjusting the bightness, and contrast as well as color balance before and after applying the plastic wrap.

Yank My Doodle, It's a Dandy!