Well, I find that my models increase in size for some reason.
My solution, not elegant, but effective sometimes. Show everything you wish to keep, that is all the geometry you wish to keep. Select everything on the screen, copy, then save the file and open a new file. Now copy into this new file everything you copied, save under a new name, me I add a new version number. Now save this new file. After finishing saving, Do a "save as" to open the area you saved this file at, and check the file size. I find it is usually very much smaller.
Not sophisticated, but works for me.