How to clean your cache?

[NedLynch]

As the title states.

I asume when people here talk about the cache file it's the one found in 1Csoftclub in the ducuments folder.

What is safe to delete? I assume of course I'll make a backup before doing anything to it.
Just read a thread about buildings looking like lego blocks with a screen shot, well my buildings look like that (yes played with the settings, can't see any changes), so I thought I might give it a try and see if maybe something else improves in the game.

Thought it warrants it's own thread since maybe others would like to do the same thing and it's easier to find the advice this way.

Thanks for any help in advance