I cant unscrew the bottom of the glass jar to clean it.

Hi I take it that the bottom was not screwed tight when the milk spilled. Try unscrewing the bottom, take it apart and clean it in warm water and mild washing liquid . Put it together again and screw tightly. And off it should go.
kolbrun

A couple of things you can check.
Unscrew the glass jar from the bottom.
Check to see if the grey seal is between the metal blade assembly and the glass jar. I had this issue and it turned out to be that a friend had reassembled the blender jar parts after taking it apart to clean it.

I need a spice mini blander jar sanyo

the older glass jar blenders were sold as a complete ***'y too.
no separate parts were available. i'm sure the stainless jars are sold in the same way...complete.

Usually the ring on the bottom of the jar unscrews. There is a rubber gasket beween the jar and the bottom hub holding the cutters.

Make sure you reassemble it correctly.

It just unscrews CCW. If it has never been romoved it may be quite a task to get it loose. Do not loose the rubber gasket in the process of cleaning it. You will never get another one without buying the whole assy.

Buying a new blender is your best option.

Here's the parts order form from Waring:
http://www.waringproducts.com/ret/parts/

Once you receive the parts, unscrew the collar from the bottom of the jar, and the old gasket and blade assembly will pop out - sometimes you have to peel the gasket apart from blender jar, but not always.

-Tha Mp3 Doctor

Try going to MarBeck.com they are a great source for small appliace parts.
http://www.marbeck.com

I just figured it out. The key is you need to think in terms of keeping the blades and the large washers separate. Here's what you do.
Thread the blade through the glass and use the white rubber gaskets against the glass and the stainless gaskets against the hardware. Then tighten the whole enchilada to the blender with the main nut (that goes on the bottom outside of the blender). Then once that's nice and tight tighten the flange that catches the blender teeth to the remaining portion of the protruding threads. Make sure you use the copper colored gasket first then the stainless washer then the stainless flange. Tighten that real good and you should be good to go.
To check if you've done it right spin the flange. If the blades spin independent of everything else you're good to blend away!