Creating field larger 32K possible then deleting the doc not possible

I have an agent which collects quite a bit of information. This information is saved in a text field in a database. Now there is the situation that the message (normal String) is larger than 32K. It is not a problem to create a document with a text field where its value is this message. But later on I cannot delete those documents anymore. I also cannot access the doument properties anymore.

The error message is:

Field is too large (32K) or View’s column & selection formulas are too long.

How I can I delete those documents again?

Thanks for any tip.