Attention soup makers

[NickPembs]

I am rather confused when it comes to using a blender to blend soup. I have a Wahl blender and also a blender attachment belonging to my Kenwood food processor. In both cases they state not to put hot stuff into them yet, everytime I see soup being blended on tv, the chefs put hot soup straight into the blenders.

What do you do when making soup that you blend? Put it in hot or leave it cool as recommended in the blender instructions?

 

[NickPembs]

Ok cheers guys. Both have glass jugs so hopefully safe enough. Pretty sure I have seen James Martin use the cloth held over the hole technique. In fact, he did that in the video that came with the blender.